Problems strike Rovers bid for Unsal
"He is an established international but he has been injured and that makes working out his percentage of performances a little difficult.
"Red tape can always threaten a deal but we are meeting with officials next week and we hope to have it all sorted out then."
It had initially been hoped that Unsal might be signed in time for Sunday's Worthington Cup final against Tottenham at the Millennium Stadium.
But it now seems more likely that his debut will be against Bolton at the Reebok Stadium a week on Saturday.