Career
Before Zenit he managed Sparta Prague and Bohemians Prague. Petržela signed a three-year contract as manager of FK Mladá Boleslav in 2002, however before the end of the calendar year it was announced that he was heading to Russia to be the new manager of Zenit Saint St. Petersburg. In the 2006/2007 season he coached Sigma Olomouc.
Petržela was appointed manager of Neftchi Baku in the summer of 2007, and was sacked six-months later on 5 January 2008.
In the season 2009/10 he coached FK Viktoria Žižkov in the Czechoslovakian 2. Liga and in the season 2010/11 he became the new coach of MFK Zemplín Michalovce in the Slovak 2. liga.
He joined Football Club Graffin Vlašim in January 2014.