Before making his league debut, Hašek played for Bohemians 1905 in the Tipsport Cup winter tournament in January 2001.

On 13 September 2003 Hašek scored for Blšany in the Czech First League match against FK Teplice, four minutes after coming on as a substitute.

[4] In March 2004, Hašek was one of nine sick Blšany players, leading to the postponement of the Czech First League fixture against Viktoria Plzeň.

[7] Hašek joined Czech First League side Příbram in 2005,[8] where he played for one season, making 13 appearances.

Following the end of the season, Hašek moved back to the Czech First League with FK Teplice in June 2007.

[9] Hašek made just one appearance for Teplice in the autumn of 2007 before moving back to Bohemians on loan in January 2008.