 The city has both professional and amateur sports teams , and a number of venues where they are based . <unk> Białystok is a Polish football club , based in Białystok , in the <unk> League that plays at the Białystok City Stadium . <unk> Białystok won the Polish Cup in 2010 , Super Cup and qualified to play in the third round qualification of the UEFA Europa League . A new 22 @,@ 500 seat stadium was completed at the beginning of 2015 . 
