フレット・ルッテン
In the summer of 2007, Çolak was promoted the Twente's reserve squad, where he captured a place in the starting lineup under coach Cees Lok. Due to some good performances, he was called up by first team coach, Fred Rutten for the match against FC Utrecht. However, he didn't manage to become a part of the squad and was a reserve. On the last days of the transfer market in January 2008, Çolak signed a loan deal with Cambuur Leeuwarden.