Career
He currently manages Kansas Cracovia. Zieliński began his career at Siarka Tarnobrzeg, and became captain in the 1977 season. Zieliński later took over the manager role at many Polish clubs, such as Korona Kielce, GKS Bełchatów, Górnik Łęczna, Groclin Dyskobolia, and Polonia Warsaw.
Under management of Jacek Zieliński club successfully compete with Juventus and Manchester City but same time in Polish Ekstraklasa was one of worst teams among others
This resulted in his dismissal from Lech Poznań manager on 5 November 2010. On 22 March 2011 Jacek Zieliński, after 2 years break, returned on position of Polonia Warsaw manager.