The Turkish international striker joins on a season-long loan, with a view to a permanent deal.
The 25-year-old becomes Rovers’ eighth signing of a busy summer for manager Steve Kean, who continues to add quality and experience to his squad ahead of the big Championship kick-off on August 18th.
Colin started his career with Bury, before enjoying short spells with Brighton and Sheffield United.
In June 2007, he joined Turkish giants Fenerbahce, who he helped reach the Champions League quarter-finals a year later, scoring in the 2-1 first leg victory over Chelsea.
After three-and-a-half seasons with Fenerbahce, including a loan spell with Toulouse, Colin made the move to their bitter local rivals Galatasaray in January 2011.
Shortly after arriving, the versatile forward famously scored the first derby goal in Galatasaray’s new stadium against his former club.
He spent the second half of last season on loan at Olympiakos, where he won the league and cup double, before returning to Galatasaray, where he also picked up a Turkish league winners’ medal.
Colin, who has 36 international caps to his name, has been on trial with Rovers since the pre-season trip to Holland and after finalising his loan switch, he will now feature in Rovers’ final friendly against Cork City this weekend.