Tumbaković returned to Partizan at the beginning of the 2000/01 league season after a season away from the club and with the NATO attacks on Yugoslavia firmly behind the league, Tumbaković would continue establishing Partizan as one of the strongest teams in the league. However, despite more domestic success with Partizan where they won the 2001/02 league title European success was far more difficult to achieve. He would stand down from his position after almost a decade in charge of FK Partizan where he was one of the most successful coaches in Yugoslavian football history.