Career
After spending his youth career at SV Waidhofen and SKN Saint Pölten in Austria, he joined the reserve team of Bayern Munich in 2005. In August 2007, Sikorski trained with the Bayern Munich first-team squad. On 12 March 2010, Sikorski announced that he will leave Bayern Munich at the end of the 2009-2010 season.
On 23 June 2010, he signed a two-year contract with Polish Ekstraklasa club Górnik Zabrze.
After a successful season in Zabrze, on 8 June 2011 he was signed by his hometown club Polonia Warsaw, where he received a four-year contract. After one season, Sikorski moved to Wisła KrakóWest
Sikorski played for Austria U-19, U-20 and U-21 national teams. He represented the country at the 2006 Union of European Football Associations European Under-19 Football Championship.