Born inKashiwa, Chiba, Japan, Sakai was introduced to football by his two older brothers and joined a school football team when he was in the third grade of elementary school.[4] Sakai initially played as a striker before converting to a full back, where he has played since.[4][5] Sakai spent 10 years with the school football team before joiningKashiwa Reysol U15 side in 2003.[6]
Sakai progressed through the ranks of the Kashiwa Reysol and learned his guidance underTatsuma Yoshida.[7] Eventually, he worked his way through to the U16 and U18 side despite suffering injuries along the way.[8] During his progress, Sakai joinedMogi Mirim to study abroad on a short–term, though he said the experience benefited him to improve his right–back and centre–back positions. Sakai eventually returned to Japan in November 2009.[9]
Ahead of the 2010 season, Sakai was promoted to Kashiwa Reysol's first team, where he signed a contract with the club and was given the number 30 shirt.[10] At the start of the 2010 season, Sakai started out on the substitute bench in number of matches.[11] It wasn't until on 5 May 2010 when he made his Kashiwa Reysol debut, coming on as a substitute forYohei Kurakawa in the 77th minute, in a 1–1 draw againstVentforet Kofu.[12] Sakai then made his first start for the side on 25 July 2010, starting the whole game and set up one of the goals, in a 2–2 draw againstJEF United Chiba.[13] It wasn't until on 31 October 2010 when he scored his first goal for the club, in a 4–1 win overMito HollyHock.[14] Sakai later helped Kashiwa Reysol secure promotion toJ. League Division 1.[15] Although he was featured several times later in the season, Sakai went on to make 12 appearances and scoring once for the side.[16]
Ahead of the 2011 season, the club announced that Sakai were among players to agree to stay at Kashiwa Reysol and was given a number 4 shirt.[17] However, he missed the start of the season, due to a metatarsal fracture injury, causing to miss six matches.[18] It wasn't until on 23 April 2011 when Sakai made his first appearance of the season, in a 1–0 win overOmiya Ardija.[19] He then quickly established himself in the starting eleven, playing in the right–back position.[20] On 12 May 2011, it was announced that Sakai signed another contract with the club.[21] He began to set up goals in number of matches for the side, including twice againstKawasaki Frontale on 16 July 2011.[22] Sakai later helped Kashiwa Reysol win the league and lifted the trophy after beatingUrawa Red Diamonds 3–2 in the last game of the season.[23] As a result, the club qualified for theFIFA Club World Cup as part of winning the league.[24] He played his first match of the tournament, starting the whole game, in theplay-off for the quarter–finals, in a 2–0 win overAuckland City.[25] Sakai then scored in thesemi–final, in a 3–1 loss againstSantos.[26] He played four times in the tournament, as Kashiwa Reysol finished fourth place in the FIFA Club World Cup.[27] At the end of the2011 season, he was awardedJ. League Rookie of the Year and was named in the J. League Best XI.[28][29] Despite being sidelined on several occasions later in the season, Sakai made 35 appearances and scoring once in all competitions.[30]
At the start of the 2012 season, Sakai started the season well when he helped Kashiwa Reysol win theJapanese Super Cup by beatingFC Tokyo 2–1 on 3 March 2012.[31] Three days after winning the Japanese Super Cup, he scored his first goal of the season in theAFC Champions League, in a 3–2 loss againstBuriram United.[32] Sakai scored and set up the club's third goal of the game, in a 3–3 draw againstYokohama F. Marinos in the opening game of the season.[33] His third goal of the season then came on 17 April 2012, in a 3–1 loss againstGuangzhou Evergrande Taobao in theAFC Champions League.[34] A month later, on 17 May 2012, he set up two goals, in a 2–1 win overCerezo Osaka.[35] His performance attracted interests from clubs in Europe, mostly Germany, as the season progressed.[36] With his move to Hannover 96 reached an agreement, Sakai made his last appearance for the club, which came on 30 June 2012, in a 6–2 win overGamba Osaka.[37] After his departure, he was given a farewell sendoff following an end of Kashiwa Reysol's match.[38] Despite missing out one match by the time of his departure, Sakai continued to regain his first team place for the side this season, playing in the right–back position and went on to make 23 appearances and scoring 3 times in all competitions this season.
It was announced on 13 June 2012 thatHannover 96 agreed to sign Sakai from Kashiwa Reysol.[39] It was later confirmed with he signed a four–year contract with the club, keeping him until 2016.[40] The transfer reportedly cost 1 million euro (100 million yen).[41]
However, at the start of the 2012–13 season, Sakai missed several matches, due to international commitment with Japan and his own injury concerns.[42] It wasn't until on 31 August 2012 when he made his Hannover 96 debut in the Qualification Round Second Leg of theUEFA League Europa League and set up one of the goals, in a 5–1 win overŚląsk Wrocław.[43] Sakai then made his league debut on 23 September 2012, where he came on as a substitute from 16 minutes to the end of the game, in a 3–1 loss against1899 Hoffenheim.[44] However, his first team opportunities with the club became limited and was on the substitute bench as a result.[45] As the season progressed, Sakai began to receive more playing time for the last four matches.[46] In his first season at Hannover 96, Sakai made 17 appearances in all competitions for the side.
Ahead of the 2013–14 season, Sakai was expected to compete in the right–back position withSteve Cherundolo once again.[47] After Cherundolo injured his knee at the start of the season, he began to play in number of matches since the start of the season, playing in the right–back position.[48] Sakai then scored his first goal for the club, in a 3–2 loss againstWerder Bremen on 3 November 2013.[49] In a follow–up match against local rivals’Eintracht Braunschweig on 8 November 2013, he started and played the whole game to keep a clean sheet, in a 0–0 draw.[50] However, Sakai soon lost his first team place around early–2014 and was placed on the substitute bench for several matches.[51] He later returned to the starting lineup on 1 March 2014, in a 1–1 draw againstFC Augsburg and regained his first team place for the rest of the season.[52] However, Sakai missed the remaining two league matches of the 2013–14 season when he suffered a knee injury, having previously suffered a same injury earlier in April.[53] In his second season at Hannover 96, Sakai went on to make 28 appearances and scoring once in all competitions.
At the start of the 2014–15 season, Sakai became Hannover 96's first choice right–back following the retirement of Cherundolo.[54][55] Along the way, he faced his own injury concern in the first half of the season.[56] By February, however, Sakai lost his first team place to new signing,João Pereira.[57] Over the next months as the season progressed, both he and Pereira fought over the right–back position.[58] However, Sakai had discipline issues when he was suspended on two occasions, including one when he was sent–off bookable offence, in a 2–1 win over FC Augsburg on 16 May 2015.[59] Despite suffering from injuries during the season, Sakai made twenty–nine appearances in all competitions.
Ahead of the 2015–16 season, Sakai was linked with a move away from Hannover 96, as clubs likeNapoli and other clubs among interested.[60] Eventually, he stayed at the club throughout the summer transfer window.[61] At the start of the season, Sakai continued to regain his first team place in the right–back position.[62] This lasted until mid-September when he suffered a strain on his thigh and missed out two matches.[63] It wasn't until on 18 October 2015 when Sakai returned from injury, coming on as a second–half substitute, in a 1–0 win over1. FC Köln.[64] Sakai was then sidelined again between late–November and early–December when he suffered injuries for the second time this season.[65] Since returning from injuries, Sakai regained back his first team place in the right–back position.[66] He then scored his first goal of the season on 23 April 2016, in a 2–2 draw againstFC Ingolstadt 04.[67] However, the draw resulted the club being relegated to2. Bundesliga after a 14-year stay in Bundesliga.[68] Shortly after, Sakai missed the rest of the season with a muscle injury.[69] At the end of the 2015–16 season, he went on to make 28 appearances and scoring once in all competitions.
Following Hannover 96's relegation, Sakai expressed his desire to leave the club.[70]
After Hannover 96's relegation, Sakai moved toLigue 1 sideMarseille on a free transfer on 23 June 2016.[71][72] It was revealed that his then national team ManagerVahid Halilhodžić convinced him to join Olympique de Marseille.[73] In addition, he became the secondJapanese player to join Olympique de Marseille sinceKōji Nakata.[74] Upon joining the club, Sakai was given a number two shirt ahead of the new season.[75]
Sakai made his Olympique de Marseille debut in the opening game of the season, where he set up a goal forFlorian Thauvin, in a 4–0 win overToulouse.[76] Sakai quickly established himself in the starting eleven for the side, playing in the right–back position.[77] This was due to the fact that he was the only player to play in the right–back position.[78] At one point, Sakai played in the right–midfield position once during a 0–0 draw againstrivals againstParis Saint-Germain on 23 October 2016.[79] However, he suffered a muscle injury and was substituted in the 65th minute, in a 2–1 win againstClermont Foot on 26 October 2016.[80] After missing one match, Sakai returned from injury, coming on as a second–half substitute, in a 3–1 loss againstMontpellier HSC on 4 November 2016.[81] As the 2016–17 season progressed, he continued to have discipline issues that saw him suspended on two separate occasions.[82] In his first season at Olympique de Marseille, Sakai made make 40 appearances in all competitions. Reflecting on his performances, his teammateFlorian Thauvin and ManagerRudi Garcia both praised his commitment and performance when the club were in a financial problems during the season.[83]
At the start of the 2017–18 season, Sakai continued to establish himself in the starting eleven as a right–back despite facing competition from withBouna Sarr over the position.[84][5] Sakai stated in an interview with France Football that he has settled in France, having suffered difficulties in his previous season.[85] His performance in a 2–0 win over Toulouse on 24 September 2017 led him to be named Team of the Week.[86] Following good performance for the side this season so far, Sakai signed a four–year contract with the club, keeping him until 2021, on 29 September 2017.[87] Having played in the right–back position in the first half of the season, he switched to playing in the left–back position following the departure ofPatrice Evra and injury ofJordan Amavi.[88] Sakai spent the next six matches, playing in the left–back position before returning to his original position.[89] During a 3–2 loss againstLyon on 18 March 2018, he suffered an injury in the first–half and was substituted as a result, leading him to be sidelined between 7–10 days.[90] Sakai made his return from injury on 5 April 2018 in the first leg of the UEFA Europa League quarter–final, in a 1–0 loss toRB Leipzig.[91] On 12 April 2018, he scored his first UEFA Europa League goal on his 28th birthday in the quarter–final return leg, in a 5–2 win over RB Leipzig to progress into the next round and a 5–3 aggregate victory.[92] Nine days later after the win, however, Sakai sustained an injury during a 5–1 win overLille and was substituted in the first half as a result; which he was sidelined for three weeks.[93] Despite recovering from his injury in mid–May, he, however, was featured on the substitute bench throughout 90 minutes, as Marseille lost 3–0 toAtlético Madrid in theUEFA Europa League Final.[94] At the end of the 2017–18 season, Sakai finished the season, making 50 appearances and scoring twice in all competitions.
At the start of the 2018–19 season, Sakai continued to remain in the first team as Marseille's first choice right–back.[95] By September, he set up two goals in the league, including one, which turned out to be a winning goal againstRC Strasbourg.[96] Sakai made his 100th appearance for the club, starting a match, in a 3–1 loss againstLazio in the UEFA Europa League match on 25 October 2018.[97] Despite suffering two separate injuries by the end of the year, he switched into playing both left–back and centre–back positions.[98] After spending a month with Japan in the AFC Asian Cup, Sakai made his first appearance for the club, starting a match, in a 1–0 win againstGirondins de Bordeaux on 5 February 2019.[99] Since returning to the first team, he regained his first team place in the right–back position.[100][101] At times, Sakai rotated in playing either the left–back and right–midfield positions.[102] He then scored his first goal of the season, scoring from a header, in a 5–1 win againstToulouse on 18 May 2019.[103][104] Despite missing one more match due to suspension, Sakai went on to make 32 appearances and scoring once in all competitions.[105] At the end of the 2018–19 season, he was named Olympique de Marseille Player of the Season.[106]
Ahead of the 2019–20 season, Sakai was linked with a move toPremier League sideTottenham Hotspur, but he ended up staying at the club.[107] Sakai started in the first four league matches of the 2019–20 season, playing in the right–back position.[108] On 29 August 2019, he signed a contract extension with Marseille, keeping him until 2022.[109] However, Sakai suffered a calf injury that saw him out for two matches.[110] He made his return to the starting line–up againstDijon FCO on his 100th league appearance, in a 0–0 draw on 24 September 2019.[111] Sakai then played three consecutive times in the left–back position between 4 October 2019 and 27 October 2019.[112] Following this, he resumed playing in the right–back position once again.[113] During a 2–0 win againstAngers SCO on 3 December 2019, Sakai suffered a shoulder injury and was taken off at half–time.[114] But he was able to make a full recovery and made his return to the starting line–up, in a 3–1 win against Bordeaux on 8 December 2019.[115] However, Sakai found himself suspended on two occasions, including one when he received a second bookable offence, in a victory againstTrélissac on penalties following a 1–1 draw in the third round of Coupe de France.[116] Sakai suffered a further setback when he suffered an adductor injury that saw him out for two matches.[117] It wasn't until on 6 March 2020 when he made his return from injury, coming on as a 77th-minute substitute, in a 2–2 draw against Amiens.[118] This turned out to be the last match of the season, due to theCOVID-19 pandemic, which caused the season to end abruptly.[119] At the end of the 2019–20 season, Sakai made 25 appearances in all competitions. Following this, he underwent a surgery on his ankle.[120]
The start of the 2020–21 season saw Sakai retain his first team place, playing in the right–back position.[121] During a match against Paris Saint-Germain on 13 September 2020, he was caught in the centre of attention after Spanish radio stationCadena SER claimed to have footage ofNeymar racially abusing him.[122] In response to the attention, Sakai denied any racist comments from Neymar on social media.[123] He set up the opening goal of the game forFlorian Thauvin, in a 3–1 win against Bordeaux on 17 October 2020.[124] Since the start of the 2020–21 season, Sakai started in every match until he missed one match, due to suspension.[125] Sakai made his return to the starting line–up againstFC Nantes on 28 November 2020 and helped the club win 3–1.[126] Following his return from suspension, he regained his first team place, playing in the right–back position.[127] However in mid–February, Sakai suffered a stomach problem that saw him out for one match.[128] He made his return from an illness, starting a match, in a 3–2 win againstOGC Nice on 17 February 2021.[129] However, his return was short–lived when Sakai received a straight red card at the last minute for a foul onKader Bamba, as Marseille drew 1–1 against FC Nantes in a follow–up.[130] After serving a two match suspension, he returned as a substitute, in a 3–1 win againstStade Brestois on 13 March 2021.[131] Despite suffering sciatica problems on three separate occasions later in the 2020–21 season, Sakai made two starts, playing either centre–back position, winning both matches.[132] He made his last appearance for the club, starting in the left–back position, in a 3–2 win against Angers OSC on 16 May 2021.[133] At the end of the2020–21 season, Sakai made 29 appearances in all competitions.
On 24 May 2021, Sakai announced that he was leaving the club despite having a year contract left.[134] During his time at Marseille, Sakai was a fan favourite among the club's supporters.[104][135][100] He considered himself to be "a proud Marseillais".[136]
He made his debut for the club, starting the match, in a 2–1 win againstSagan Tosu on 14 August 2021.[138] Sakai helped Urawa Red Diamonds keep five consecutive clean sheets in the league between 21 August 2021 and 25 September 2021.[139] He scored his first goal for the club, in a 2–1 win againstFC Tokyo on 25 September 2021.[140] His second goal for Urawa Red Diamonds, in a 1–1 draw againstKawasaki Frontale on 3 November 2021.[141] Sakai then started inEmperor's Cup final againstOita Trinita and helped the club win 2–1 to win the tournament.[142] At the end of the 2021 season, Sakai made 18 appearances and scoring 2 times in all competitions.
In theJapanese Super Cup against Kawasaki Frontale, Sakai set up a goal forAtaru Esaka, who went on to score twice, in a 2–0 win.[143] However during a match againstJúbilo Iwata on 19 March 2022, he suffered a foot injury and was substituted in the 53rd minute, resulting in him out for three weeks.[144] On 10 April 2022, Sakai made his return from injury, starting a match, against FC Tokyo and helped Urawa Red Diamonds keep a clean sheet, in a 0–0 draw.[145] In a follow–up match, he captained the club for the first time, and set up one of the goals, in a 4–1 win againstLion City Sailors.[146] However, Sakai's return was short–lived when he suffered a foot injury once again and was out for two months.[147] It wasn't until on 26 June 2022 when Sakai made his return from injury, coming on as a second–half substitute, in a 1–0 win againstVissel Kobe.[148] However during a 3–1 win against Kawasaki Frontale on 30 July 2022, he suffered a knee injury and was substituted in the 61st minute.[149] Two weeks later on 10 August 2022, Sakai returned to the starting line–up from injury as captain, in a 3–0 win againstNagoya Grampus in the second leg of the J.League Cup quarter–finals.[150] In the AFC Champions League semi–finals againstJeonbuk Hyundai Motors, he set up the opening goal of the game and started the whole game all the way to penalty–shootout in a 2–2 draw, as Urawa Red Diamonds won on penalties to help the club reachthe final.[151] However, his return was short–lived when Sakai suffered a calf injury that saw him out for two matches.[152] On 14 September 2022, he made his return from injury, coming on as a second–half substitute, in a 1–0 loss against Cerezo Osaka.[153] Following this, Sakai started in the next five matches until he missed the last game of the season, due to suspension.[154] At the end of the 2022 season, Sakai made 28 appearances in all competitions.
Ahead of the 2023 season, Sakai was appointed as the new captain of Urawa Red Diamonds.[155] He started in the first seven league matches of the season and led the club on winning their first four consecutive wins in the league for in over six years.[156] Along the way, Sakai scored his first goal of the season, in a 2–1 win overAlbirex Niigata on 18 March 2023.[157] However during a match against Nagoya Grampus on 9 April 2023, he suffered an injury and was substituted in the 68th minute.[158] But Sakai was able from injury when he led Urawa Red Diamonds secured a dramatic victory in the 2022 AFC Champions League final. Sakai led Urawa Red Diamonds' captain to beat the defending championsAl Hilal 2–1 on aggregate, making it their third win in the competition.[159] This victory marked the club's third AFC Champions League title, solidifying their position as a powerhouse in Asian club football.[160] For his performance, he was named AFC Champions League's Most Valuable Player.[161] Following his return from injury, Sakai regained his first team place, as well as, his captaincy.[162] He then scored his second goal of the season, in a 2–1 win againstSanfrecce Hiroshima on 31 May 2023.[163] In the first leg of the J.League semi–final against Yokohama F. Marinos, Sakai received a red card for a second bookable offence, in a 1–0 loss.[164] After serving a one match, he returned to the starting line–up as captain for theJ.League Cup final againstAvispa Fukuoka, but was unable to help Urawa Red Diamonds win the final after losing 2–1.[165] Shortly after, Sakai suffered a meniscus injury on his right knee that expect him to be out for the rest of the season.[166] But he made his return from injury, coming on as an 81st-minute substitute, in a 2–1 win againstClub León inthe second round of theFIFA Club World Cup.[167] Sakai returned to the starting line–up as captain inthird place play–offs, in a 4–2 loss againstAl Ahly SC.[168] At the end of the 2023 season, he went on to make 37 appearances and scoring 2 times in all competitions.
Ahead of the 2024 season, Urawa Red Diamonds announced that Sakai would retain his captaincy.[169] He scored his first goal of the season, in a 1–0 win againstHokkaido Consadole Sapporo on 10 March 2024.[170] Sakai then set up two goals in two matches between 30 March 2024 and 3 April 2024.[171] However during a 2–1 loss against FC Tokyo on 3 April 2024, he suffered a knee injury that saw him out for a month.[172] A month later on 15 May 2024, Sakai made his return from injury, coming on as a late substitute, in a 3–0 win againstKyoto Sanga.[173] After announcing his departure, he and teammateAlexander Scholz were given a farewell sendoff following the club's matches against Júbilo Iwata on 30 June 2024.[174]
On 11 June 2024, it was reported by Andy Harper that Sakai had agreed to joinAuckland FC ahead of their inauguralA-League Menseason.[175] Amid the transfer speculation, it was announced on 24 June 2024 byUrawa Red Diamonds that he had left the club.[176]
On 24 July 2024, Sakai's transfer to Auckland FC was officially confirmed.[177] On 15 October, Sakai was named club captain for the inaugural season, withJake Brimmer andTommy Smith appointed as vice-captains.[178]
On 19 October 2024, Sakai made his competitive debut for Auckland FC in the club’s first-ever match, a 2–0 win overBrisbane Roar. He set up the club’s first goal by slicing a cross that was turned into an own goal byHarry Van Der Saag.[179]
On 28 December 2024, Sakai scored his first goal for the club in a 4–1 win over theCentral Coast Mariners.[180] On 17 February 2025, it was announced that Sakai had extended his contract with Auckland FC until the end of the 2025–26 season.[181]
After spending three years between 2008 and 2011, representing Japan's youth system, Sakai was called up byJapan U23 squad for the first time in May 2011.[182] On 1 June 2011, he made his Japan U23 on the same day, in a 3–1 win overAustralia U23.[183] Three weeks later on 23 June 2011, Sakai scored his first goal for the U23 side, insecond leg of the Asian Qualifiers Preliminary Round of the Summer Olympics, in a 2–1 loss againstKuwait U23, but Japan U23 won 4–3 on aggregate.[184] After making his U23 debut, he became a regular for the U23 throughout the year in the right–back position.[185] On 22 February 2012, Sakai scored again and set up one of the goals, in a 4–0 win overMalaysia U23.[186]
On 2 July 2012, Sakai was called up for the2012 Summer Olympics Football tournament in London.[187] He started in a match, playing 74 minutes before being substituted, in a 1–0 win overSpain U23.[188] Sakai went on to start three more matches in the tournament, as Japan U23 reached the semi–finals and finished fourth place.[189]
Sakai was named as one of Japan's three over-age players for theOlympicon home soil, alongsideMaya Yoshida andWataru Endo.[190] On 22 July 2021, he made his first appearance for the U23 side, starting a match, in a 3–0 win againstSouth Africa.[191] Sakai scored his first goal of the tournament, in a 4–0 win againstFrance.[192] After serving a one match suspension, he returned to the starting line–up, losing both matches inthe semi–finals andbronze medal match againstSpain and Mexico respectively.[193]
Sakai playing forJapan againstParaguay on 12 June 2018.
In October 2011, Sakai was called up for the first time to thesenior squad for a match againstVietnam andTajikistan, but he appeared as an unused substitute instead.[194] After eight months since being called up to the Japan's national team, Sakai made his debut for the Samurai Blue, coming on as a second–half substitute, in a 2–0 win overAzerbaijan in theKirin Challenge Cup on 23 May 2012.[195] By April 2012, he began to adjust playing under ManagerAlberto Zaccheroni, having understood his tactics and management.[196] For the rest of 2012, Sakai continued to get more playing time for Japan, including making his first start for the Samurai Blue againstUnited Arab Emirates on 6 September 2012.[197][198]
In 2013, Sakai began to compete withAtsuto Uchida over the right–back position, which saw both each winning the position in number of matches.[199] Six months later, he was called up by the Samurai Blue for the2013 Confederations Cup squad.[200] Sakai played two of the three matches in the group stage, losing both matches, and was eliminated from the tournament.[201] Following the conclusion of the FIFA Confederations Cup tournament, he then started the next six Japan international matches in the absence of Uchida, who suffered a torn tendon and was eventually out for the 2013–14 season.[202] During which, Sakai set up the equalising goal forYoichiro Kakitani, in a 1–1 draw againstBelgium on 19 November 2013.[203]
In May 2014, Sakai was named in Japan's preliminary squad for theFIFA World Cup in Brazil.[204] Eventually, he made it to the final cut for the 23-man squad.[205] However, Sakai made no appearances in the FIFA World Cup, as he spent the rest of the campaign on the substitute bench.[206] After the tournament ended, Sakai made his first appearance for the Samurai Blue in three months on 5 September 2014, in a 2–0 loss againstUruguay.[207] However, he was absent from theAFC Asian Cup tournament under a new management ofJavier Aguirre.[208]
After Uchida's absent in recent matches of 2015, Sakai began to make an impact to keep his first team place for Japan.[209] For the next two years, he established himself in the right–back position for the Samurai Blue and helped Japan qualify for theFIFA World Cup in Russia.[210] Sakai also assisted five goals along the way, including two separate matches againstThailand.[211]
In May 2018, Sakai was named in Japan's preliminary squad for the FIFA World Cup in Russia.[212] Eventually, he made it to the final cut of the 23 men squad.[213] Sakai made his World Cup debut againstColombia in Matchday 1 of the Group Stage, starting the whole game, in a 2–1 win.[214] He started the next two matches for Samurai Blue, and eventually qualifying for the knockout stage, due to receiving fewer yellow cards than Senegal, becoming the only Asian team to do so in the 2018 World Cup.[215] Sakai started in the match againstBelgium in the round of 16 match, as Japan was knocked out of the tournament after losing 3–2.[216]
Following the end of the World Cup, Sakai didn't receive another call–up from Japan until on 4 October 2018.[217] He set up a goal forRitsu Doan, in a 4–3 win againstUruguay on 16 October 2018.[218] In a follow–up match againstVenezuela, Sakai scored his first goal for the Samurai Blue, scoring the opening goal of the game, in a 1–1 draw.[219] In December 2018, he was one of 23 Japanese players selected for the2019 AFC Asian Cup.[220] Sakai started in the right–back position and played two matches in the group stage to help Japan qualify for the knockout stage.[221] He helped the Samurai Blue reach all the way to theAFC Asian Cup final and kept three consecutive clean sheets along the way.[222] In theAFC Asian Cup final againstQatar, Sakai started the match in the right–back position, as Japan loss 3–1, finishing as runner–up in the process.[223] Reflecting on the AFC Asian Cup final, he said: "It's a bad memory, I don't want to think about this final. Fortunately, OM was there when I came back and we won. Psychologically, I'm fine. Physically, I'm fine. Last season, we played every three days, I got used to that rhythm, so there's no problem."[100]
Following the end of the AFC Asian Cup, Sakai didn't make another appearance for Japan until on 5 June 2019 againstTrinidad and Tobago in the Kirin Challenge Cup, where he started the match, in a 0–0 draw.[224] He then set up three goals in five matches for the Samurai Blue between 5 September 2019 and 14 November 2019.[225]
On 1 October 2020, Sakai was called up to the Japan's squad for the first time in eleven months, resulting in him making an appearance againstCameroon, drawing 0–0.[226] In a match againstMyanmar on 28 May 2021, he set up a goal forYuya Osako, who scored five goals, in a 10–0.[227] Sakai then five starts for the Samurai Blue in theFIFA World Cup qualification between September 2021 and February 2022.[228]
Sakai had to wait until on 15 September 2022 when he was called up to the Japan's squad for theKirin Cup Soccer.[229] Sakai made his first appearance for the Samurai Blue in eight months, starting a match, in a 2–0 win againstUnited States.[230] On 1 November 2022, he was named in the final squad for the2022 FIFA World Cup in Qatar.[231] On 24 November 2022, Sakai started in the right–back position againstGermany and played 75 minutes before being substituted forTakumi Minamino, who played a role for the equalising goal, in eventual Japan's 2–1 win.[232] His next appearance for the Samurai Blue came againstCroatia on 5 December 2022, coming on as a 75th-minute substitute, as the match eventually ended 1–1 with Japan crashing out after their defeat on penalties.[233] Following the end of the tournament, he has not been called up the Samurai Blue's squad since.
Growing up, Sakai comes from a studious family, as his father is a doctor.[5] One of his older brother is a researcher.[5] Sakai said his idol growing up wasRonaldo and watched his performance in the2002 FIFA World Cup.[5] In 2014, Sakai revealed that he married a non-celebrity woman and described her as supportive of his football career.[234] It was announced in November 2014 that Sakai would become a father and his wife gave birth to a baby girl in January 2015.[235][55] On 27 September 2019, he announced that he's a father for the second time.[236]
Sakai is a fan ofMiso soup and once said: "Take only miso soup because miso soup is a necessity for me."[237] In addition to speaking Japanese, Sakai speaks Portuguese, German (having learned the language twice a week during his time at Hannover 96), French and English.[72][5][238][239][100] Since moving to Europe, Sakai spoke out the culture in Germany and France.[240][5][239]
In May 2018, Sakai published his first book titled "Resetting Power 'Nature and the Mind Becomes Stronger' 46 Concept".[241] In the wake ofCOVID-19 pandemic, he donated 20,000 euros to Phoceo Endowment Fund.[242] Along withYūki Ōtsu, they created a website to help the general public.[243]
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