Haller (Ris-Orangis, June 22, 1994) joined Ajax from West Ham United in the winter transfer window during the 2020/2021 season. On January 10, 2021, he made his debut for the first team during the match between Ajax and PSV (2-2). The French-born Ivorian international played a total of 66 official matches for Ajax's first team and scored 47 goals.
Haller won the double in his first season at Ajax, claiming the league and cup trophies in 2021. Last season, the Ivorian international won the league for the second year in a row and was the topscorer in the Eredivisie with 21 goals. Thanks in part to his eleven goals in last season's UEFA Champions League, Haller was included in the UEFA Champions League 'Team of the Season'.