Mercan made his professional debut for Schalke 04 in the DFB-Pokal on 10 August 2019. He came on as a substitute in the 61st minute and scored the fourth goal in the 73rd minute in a 5–0 away win against SV Drochtersen/Assel.[2]
On 22 August 2019, he signed his first professional contract with Schalke until June 2023.[3]
Fatih Karagümrük
On 16 August 2021, he agreed to join Süper Lig club Fatih Karagümrük on a season-long loan.[4] On 5 July 2022, the move was made permanent.[5]
Fenerbahçe
On 21 June 2024, Mercan transferred to Fenerbahçe SK for an undisclosed fee on a 4-year deal. He made his first appearance in a friendly match aganist Romanian side, FC Petrolul Ploiești on 29 June 2024. He entered the game as a substitute, entering the game at the 46th minute replacing Luan Peres.
On 25 August 2024, he made his Süper Lig debut against Rizespor in a 5-0 away win.[6]
International
Mercan began his youth international career with Germany, appeared for the under-19 and under-20 teams. On 16 APril 2019, he made his international debut with Germany U19 against Denmark U19 in a friendly match, Germany lose 5-0. On 13 October 2019, he played with Germany U20 against Switzerland U20 (away win 1-0) and on 18 November 2019, he played against Portugal U20 (away win 2-0) in UEFA U20 Elite League matches.
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