Career
Club
He was released from Cracovia on 15 July 2011. Then, he joined Greek side Kavala on 11 August 2011 and returned to Poland for Podbeskidzie Bielsko-Biała on 29 December 2011. International
In 1999 he played at the Fédération internationale de football association U-17 World Championship tournament.
In 2000 Mierzejewski played at the Union of European Football Associations European Under-16 Football Championship tournament.
Now he is a part of Poland national football team