For the 2013–14 season Müller moved to VfB Stuttgart II. On 10 June 2013 he signed a contract until June 2015 with VfB Stuttgart.
On 1 August 2014 he was loaned out to FC Energie Cottbus. Simultaneously he extended his contract with Stuttgart until 2016. Cottbus hired him as a replacement for just recently injured regular goalkeeper René Renno.
For the 2015–16 season he moved to 1. FC Heidenheim.
