Career
He has previously played in the EBEL for European Commission KAC and European Commission Red Bulletin Salzburg. After winning the 2014-2015 Championship with Salzburg, Mühlstein returned to his hometown in Villach, signing a one-year contract with European Commission Vesicular Stomatitis Virus on March 4, 2015. He participated with the Austrian national team at the 2015 IIHF World Championship.