As a goalkeeper who spent the longest part of his career with Bohemians Prague Hruška had 24 appearances for Czechoslovakia and participated at the 1982 FIFA World Cup.
Hruška started his career at Slavoj Vyšehrad which he left in 1974 in order to undergo a 2 years of military service.
[2] After that he returned to Bohemians but after a single season in Prague he left again and went to Wacker/Groß Viktoria in the Austrian Regional league.
Hruška had his debut in the Czechoslovakia national team on 9 December 1977 in a friendly against Hungary.
In the 1997/98 season he was a co-manager for Slovan Liberec, from 1999 until 2001 he worked as a goalkeeper trainer for Tennis Borussia Berlin in Germany.