Trossard began his professional career in Belgium withGenk, scoring 39 goals, before embarking on four consecutiveloans between 2012 and 2016. He then spent four years in England atBrighton & Hove Albion, before joining fellow Premier League side Arsenal in 2023 for £27 million (including add-ons).
Trossard joined theK.R.C. Genk youth academy from theK. Bocholter V.V. academy in 2010. He was promoted to the senior squad in 2012, making his first, albeit brief, appearance on 13 May 2012 in a league match againstK.A.A. Gent. The game ended 3–1 in favour ofGent. Trossard was introduced in the 87th minute, replacingStef Peeters.[4] Those three minutes were the only ones he played in the league that season. For several seasons, he was consistently sent out on loan. As a result, he didn't score his first league goal for Genk until over four years later, coming in a 4–1 away loss toK.V. Kortrijk on 25 September 2016. He was brought on as a substitute forLeon Bailey and scored in the 63rd minute, assisted byBryan Heynen.[5]
In January 2013, Trossard was sent out on loan toLommel United. In twelve league appearances, he scored seven goals. His debut for Lommel came on 3 February 2013 in a 1–0 away loss toSint-Truiden. He was introduced as a substitute in the 63rd minute, coming on for Thomas Jutten.[6] Arguably, the greatest game during his loan spell was his hat-trick in a 3–2 home victory overK.F.C. Dessel Sport, in front of 2000 fans at the Soevereinstadion. He scored one in the 11th minute, another in the 60th (from the penalty spot), and the last in the 74th. He was subbed off in the 88th minute.[7]
In July 2013, Trossard was loaned out toK.V.C. Westerlo. In 17 league appearances, he scored three goals. The first of these goals came on 9 August 2013 in a 2–0 away win over his former clubLommel United. He scored in the 74th minute.[8] He made his debut on 3 August 2013 in a 2–2 home draw withA.F.C. Tubize. This was also his first start for the club.[9] Trossard helped Westerlo to promotion to
In July 2014, Trossard was loaned out toLommel United again. He continued his goal scoring form, finding the net 16 times in 33 league matches. He scored his second career hat-trick for Lommel on 22 March 2015 in a 6–0 demolition ofRacing Mechelen. His goals came in the 33rd, 61st, and 69th minutes.[10] That season, Lommel were only nine points off promotion back to the top flight.
In July 2015, Trossard was loaned out again, this time toOH Leuven. In 30 league matches, he scored eight goals. He made his Leuven debut on 25 July 2015 in a 3–1 away loss to the club he had been loaned out from inGenk. Genk didn't enforce the rule of not allowing loanees to play against them, as he was brought off the bench in the 61st minute, replacingYohan Croizet.[11] His first league goal for Leuven came on 16 August 2015 in a 2–0 victory overCharleroi. He made an immediate impact off the bench. He was brought on forYohan Croizet in the 82nd minute, and scored in the 85th.[12]
On 26 June 2019,Brighton & Hove Albion agreed to sign Trossard, who joined on a four-year deal with an option for an extra year, becoming the club's second signing of the summer, followingMatt Clarke's arrival from Portsmouth.[13] Trossard made his debut on 17 August where he scored the equaliser in the 1–1 home draw againstWest Ham United. Earlier in the game he was denied a goal for offside byVAR.[14] Trossard scored twice againstNorwich in the2019–20 season, one in the 2–0 home victory on 2 November 2019, and again in a crucial 1–0 away win on 4 July 2020 to help Brighton push further away from the bottom three.[15][16]
On 31 January 2021, Trossard scored the only goal in a 1–0 home win overTottenham Hotspur to secure the Seagulls' first home league win of the2020–21 season.[17] Trossard played in Brighton's 1–0 away victory over defending championsLiverpool on 3 February claiming their first league win atAnfield since 1982, where he deflectedSteven Alzate's shot back onto Alzate, being awarded the assist in the only goal of the game.[18] On 14 March 2021, Trossard scored the winner in a 2–1 away win overSouthampton, sealing Brighton's first win over the Saints in Premier League history.[19] Trossard scored the first goal of Brighton's comeback from 2–0 down to beat championsManchester City 3–2 on 18 May, with fans returning to football.[20]
Trossard scored his first goal of the2021–22 season on 11 September, firing in a 90th-minute winner scoring the only goal of the game in the 1–0 away win over Premier League newcomersBrentford.[21] He conceded a penalty by barging intoConor Gallagher away atCrystal Palace in the firstderby game of the season on 27 September, whereWilfried Zaha converted the spot kick to take Palace 1–0 up at the break. However,Neal Maupay scored a 95th-minute equaliser to take a point back to the south coast.[22] Trossard scored Brighton's equaliser away at Liverpool on 30 October, completing a stirring fightback, coming from 2–0 down to earn a 2–2 draw.[23] He enjoyed his time in North London in April 2022 by scoring two goals in two games againstArsenal and Tottenham. Opening the scoreline in the 2–1 victory at Arsenal on the 9th and scoring a 90th-minute winner at theTottenham Hotspur Stadium on his 100th Albion appearance, seven days later. This was his sixth goal of the season, making it his best scoring season since joining the Sussex club.[24][25][26] On 7 May, Trossard assisted two goals and scored one with his chest which had to be reviewed by VAR for potential handball in the 4–0 home thrashing ofManchester United.[27]
Trossard scored his first goal of the2022–23 season adding Brighton's second in the 2–0 away win at West Ham on 21 August, helping maintain their unbeaten run to 11 games against the "Hammers" in the Premier League.[28] He scored his first home goal of the season on 4 September, putting Brighton back ahead in the eventual 5–2 home win overLeicester City.[29] In their next match on 1 October, Trossard became the first Brighton player to score a Premier League hat-trick in the 3–3 away draw at Liverpool. His first half double meant he was the first player to score two first-half goals atAnfield sinceWigan Athletic'sAmr Zaki in October 2008.[30] Trossard's hat-trick also meant he had scored four goals in two appearances at Anfield.[23] Trossard scored his 100th club career goal on 22 October, pulling one back, in the eventual 3–1 away loss at two-time defending champions Manchester City.[31]
In early January 2023, however, Trossard's relations with the club deteriorated sharply after managerRoberto De Zerbi said he would drop the player for leaving a training session without permission. De Zerbi said he did not like the player's attitude or behaviour.[32] In response, agent Josy Comhair accused De Zerbi of having humiliated the player in front of his team mates, saying a transfer was the best solution.[33]
On 20 January 2023,Arsenal confirmed the signing of Trossard on a long-term contract.[34] The fee consisted of a guaranteed £20 million, and around a further £7 million in add-ons.[35] He was given the number 19 shirt by the club,[36] and made his debut on 22 January as a substitute in a 3–2 win overManchester United.[37] He made his full debut on 27 January against Manchester City in theFA Cup fourth round.[38]
On 11 February 2023, Trossard came on as a substitute against Brentford and within four minutes scored his first goal for the club in a 1–1 draw.[39] On 18 February, he was handed his first Premier League start for Arsenal in a 4–2 victory atVilla Park.[40] One week later, Trossard provided his first assist for the club in a 1–0 win atLeicester City.[41] He assisted all three of Arsenal's goals in their win atFulham on 12 March,[42] becoming the first player in Premier League history to provide a hat-trick of assists in the first-half of a game, away from home and the first player sinceSanti Cazorla to score a hat-trick and also register a hat-trick of assists in the same season.[43] By the end of his first half-season with Arsenal, he had scored one goal and provided 10 assists.[44]
On 6 August 2023, Trossard came off the bench and found the net in the final minutes of stoppage time to make it 1–1 against Manchester City in the2023 FA Community Shield, forcing apenalty shootout which Arsenal went on to win 4–1.[45] On 17 September, he scored the only goal of the game in a 1–0 away win overEverton, helping to seal Arsenal's first win atGoodison Park since 2017.[46] Three days later on 20 September, he scored his firstChampions League goal and provided an assist in a 4–0 win overPSV Eindhoven on his debut in the competition.[47] On 21 October, coming off the bench just after they scored a goal at the 78th minute, Trossard found the net at the 84th minute in a comeback againstChelsea which finished 2–2.[48] On 12 March 2024, Leandro Trossard scored the only goal in a 1–0 second leg win of the Champions League round of 16 tie againstFC Porto, taking the game to extra-time and penalties which Arsenal won 4–2, helping the Gunners progress to the quarter-final of the Champions League for the first time since 2009–10, ending a run of seven consecutive last 16 eliminations in the competition.[49]
On 6 April 2024, Trossard scored against his former club Brighton, scoring the third goal in a 3–0 away win that put Arsenal on top of thePremier League table.[50]
In the summer of 2025, Trossard signed a new contract with Arsenal, despite speculation about a potential departure from the club.[51] Starting the season as an impact substitute, Trossard provided an assist in Arsenal’s 3–0 win againstNottingham Forest and scored in the 2–0 Champions League win overAthletic Bilbao.[52] On 23 November, he scored and assisted in a 4–1North London derby victory against Tottenham Hotspur.[53]
Trossard has been called up to theBelgium national team on multiple occasions.Roberto Martínez first named him in the Belgium squad in September 2018,[54] again one month later when Trossard had to withdraw through injury,[55] Trossard remained on the bench again in March 2019. He made his debut on 5 September 2020 in aNations League game againstDenmark, he substitutedDries Mertens in the 80th minute of the 2–0 away victory.[56] On his first international start, Trossard scored his first goal for his country also adding a second in an 8–0 crushing ofBelarus in a2022 World Cup qualifier on 30 March 2021.[57]
Trossard was named inBelgium's 26-man squad forEuro 2020 on 17 May 2021, with the tournament taking place in the summer of 2021 due to the previous year's postponement as a result of theCOVID-19 pandemic.[58][59] He made his first appearance of the tournament in Belgium's final group match againstFinland on 21 June with Belgium already through to the knockouts. Trossard started the match later being replaced byThomas Meunier in the 75th minute of the 2–0 victory at theKrestovsky Stadium inSaint Petersburg that secured the Belgians top spot ofGroup B.[60] This turned out to be his only game as Belgium were knocked out byItaly in the quarter-final after a 2–1 defeat at theAllianz Arena in Munich on 2 July.[61]
In October 2021, Trossard was a part of Belgium's squad for theUEFA Nations League Finals in Italy.[62] He made two substitute appearances where Belgium lost toFrance in the semi-final and losing again toItaly in the third-place match to come fourth.[63][64]
In an international friendly at home againstBurkina Faso on 29 March 2022, Trossard scored his third goal for his country, where he also assistedHans Vanaken's andChristian Benteke's goals in the 3–0 win.[65] On 8 June, he scored his second international brace in the 6–1 home thrashing overPoland in theUEFA Nations League.[66]
On 10 November, Trossard was named in Belgium's 26-man squad for the2022 FIFA World Cup.[67]
Trossard has been in a relationship with Laura Hilven since 2014, and the couple got married in June 2019.[3][68] They have two sons, born in April 2017 and January 2023.[69] Trossard's native language is Dutch.[70]