Jiránek started his professional career in 1997 for Bohemians Prague, making 55 appearances, before leaving for Slovan Liberec in 1999.

[8] Jiránek made his debut in the starting eleven for the League Cup third-round match against MK Dons, and had a good chance to score as Birmingham won 3–1.

[9] His second start came in a tidy performance as several first-team regulars were rested for the FA Cup third round tie against Millwall which Birmingham won 4–1.

Jiránek's first major international tournament came at Euro 2004, where he made 4 appearances before being ruled out of the semi-final with a thigh injury.

[18] He also was named in the Czech squad for the 2006 World Cup, but despite playing 5 qualifying matches, he did not make an appearance at the finals.