Career
In the summer 2005, he joined Widzew Łódź on three-year contract. On December 2006, he moved to Legia Warsaw on three and a half contract. In the summer 2010, he joined Russian club Football Club Sibir Novosibirsk.
In the winter 2011, he joined Polish club Jagiellonia Białystok.
In the winter 2012, he joined Polish club Górnik Zabrze on one-year contract, but he has been injured in a friendly match with MFK Ružomberok and the club has terminated contract with him after 4 days. Grzelak made his debut for the Polish national team in a friendly versus the United Arab Emirates in Abu Dhabi on December 6, 2006, scoring twice.
International goals
Scores and results list. Poland"s goal tally first.