Career
He made over 100 appearances in the Gambrinus liga. He also played in the 2. Bundesliga in Germany for two seasons.
Onderka played international football at under-21 level for Czechoslovakian Republic U21.
He made over 100 appearances in the Gambrinus liga. He also played in the 2. Bundesliga in Germany for two seasons.
Onderka played international football at under-21 level for Czechoslovakian Republic U21.