BSC Old Boys
From an early age he played for the Basel football club BSC Old Boys Basel. At Derdiyok is a powerful striker who can also play as centre-back if required. He started his career with Swiss minnows Old Boys at the beginning of the 2005–06 season in which scored 10 goals in just 18 appearances. He scored a goal in the Swiss Cup 1–6 defeat against FC Basel on 22 October 2005.