In November, Lacazette scored Arsenal's opening goal in a 5–0 rout of Huddersfield Town and in December, he scored Arsenal's only goal in a 3–1 home defeat to Manchester United. Following a protracted period on the sidelines through injury, Lacazette returned to the Arsenal squad in the 3–0 home win over Stoke City in March, where he replaced Danny Welbeck in the 61st minute and scored the Gunners' third goal of the game, after new signing and designated penalty-taker Pierre-Emerick Aubameyang, allowed Lacazette to take the penalty. Lacazette would then score twice on his Europa League debut for Arsenal, in a 4–1 win against CSKA Moscow, marking his first goal in European competition for the club. Lacazette then registered his third goal in European football for Arsenal, by scoring in the Europa League semi-final 1–1 draw with Atlético Madrid. The goal was Lacazette's seventh goal in seven games for the club since returning from injury. Lacazette scored in Arsène Wenger's final home match, a 5–0 rout of Burnley, the team's second goal and his fourteenth league goal of the season, Lacazette also picked up an assist for the team's opening goal as well. After the departure of manager Arsène Wenger, Lacazette found himself dropped to the bench under new manager Unai Emery, making substitute appearances against Manchester City, Chelsea and West Ham United. Lacazette made his first start under Emery in Arsenal's 3–2 away win over Cardiff City on 2 September, where he registered an assist and scored his first goal of the season. On 1 April 2019, Lacazette scored Arsenal's second goal in a 2–0 win over Newcastle United, which sent Arsenal into third place and two points clear of rivals Tottenham Hotspur, Chelsea and Manchester United. The goal marked Lacazette's thirteenth goal of the season in the Premier League. On 3 May 2019, Lacazette was voted by Arsenal supporters as the club's player of the season. Lacazette scored his first goal of the 2019–20 season in Arsenal's home opener, a 2–1 victory against Burnley on 17 August 2019. Lacazette has featured for all of France's national youth teams beginning with the under-16 team making his debut in the team's 2–0 victory over Cameroon on 3 April 2007 at the Montaigu Tournament.