It looks like you're new here. If you want to get involved, click one of these buttons!
I don't know too much about him.....
Taken from Wiki (and translated from German):
Müller began his career at Karlsruher SC . 2012 he moved to SV Sandhausen , where he first was 2013 in the first team, but was never used. 2015 he moved to Austria for SV Austria Salzburg . His professional debut came on Matchday 1 2015/16 against SKN St. Pölten . After Salzburg was relegated to the Regionalliga, he left the club in the summer 2016