 Bozsik achieved his first success a third position in the Hungarian Championship with Vasas SC.The team from Zalaegerszeg, where he was from 2001 to 2003, he led to its greatest success, their first Hungarian Championship in 2002.During the 2002-03 UEFA Champions League, ZTE defeated Croatian champions NK Zagreb and caused an upset with their surprise 1 - 0 victory against Manchester United in the first leg of their qualifier.