 He made his debut for the club two days later, coming on as a substitute in the 85th minute, and scoring the winning goal in a 3–2 victory over Alanyaspor.On 12 May 2018, Diagne scored his first hat-trick for the club in a 3–1 win over Gençlerbirliği.During his first season in Istanbul, he played 17 games and scored 12 goals.