Bartosz Piotr Grzelak (born 2 November 1978) is a Swedish football manager who currently serves as the head coach of Nemzeti Bajnokság I club Újpest FC. He is also a former footballer who played as a midfielder. Playing career. Grzelak made his sole Allsvenskan appearance for AIK on 26 October 1997 in a 1997 Allsvenskan game against Malmö FF when he replaced Johan Mjällby in the last couple of minutes of the game. He was also a Sweden U19 international, appearing in seven games in 1996. Managerial career. In 2009 Grzelak became playing assistant manager for IK Frej.
https://en.wikipedia.org/wiki/Bartosz_Grzelak