In 2019, Müller signed for Swiss second-tier side
FC Schaffhausen, where he was regarded as one of the club's most important defenders and penalty-taker, and was described as a club "legend". He also captained the team. On 15 July 2023, Müller signed with German
3. Liga side
SC Freiburg II. In June 2024, Müller joined
Swiss Challenge League club
FC Aarau on a three-year deal. ==International career==