He hasn't exactly made out that he wants to go anywhere yet, so the ball is still in our court. I'm sure he's happy here and he does come across as one of the rare types of footballers who would want to repay the faith we've shown in him.
Also, was it Fenerbache or Besiktas that put a bid in for him in the summer? Didn't Saha say he was happy to stay here? If that's the case, then you'd have to say you're confident of him signing a new deal. I know Turkey is a lot more hostile than the UK, but both Besiktas and Fenerbache and arguably bigger than the likes of Sunderland.
Personally, I can't see him signing a new deal anywhere but here.