I think this deal is taking forever and possibly wont happen because Cook/Marwood/Khaldoon dont see this deal as being worth the 20m or so. He is available on a free next year and that is what C/M/K are likely looking at.
It makes no sense to spend 20mil on someone when they are either available on a free next year or something like 10m in Jan when Arse dont want to be left with nothing.
And tbh i dont even rate Nasri that highly. Had very few consistent games last year and without Fabregas so he had the proper chance to build on games. He didnt and apart from the Fulham game i cant remember him having a top game (Probably wrong but just what i saw)