NK Rudar
Kolsi, a midfielder, joined Willem II in the summer of 2004 after previously playing for FC Jokerit in the Finnish Veikkausliiga. He left the Dutch club in 2006 and joined TOP Oss, and later FC Eindhoven. In summer 2007 he went to Slovenia where he played for NK Maribor and NK Rudar Velenje in the Slovenian PrvaLiga. Kolsi made a brief return to his old club Willem II in January 2012, before returning to Slovenia, signing for NK Celje for the 2012–13 season.