Career
Koubek coached several Czechoslovakian clubs. He placed second with Football Club Zenit Čáslav in Czechoslovakian Second League in 2008-2009 season. In the 2009-2010 Czechoslovakian First League, he led Football Club Baník Ostrava to the third place in the league table.
The 2010-2011 season however started with miserable results for Baník, with the club losing seven of the opening 13 matches, and Koubek was sacked in October.
Koubek returned to the Czechoslovakian First League as the manager of Mladá Boleslav on 28 May 2011. Koubek led Boleslav to fourth place in the 2011-2012 Czechoslovakian First League and qualification for the following season"s Union of European Football Associations Europa League.
However, after a run of three consecutive league defeats, he resigned from his position in September 2012. Koubek was appointed to the manager"s position at Slavia Prague in September 2013 following the resignation of former boss Michal Petrouš.
He was sacked in March 2014.
Managerial.