I think they already convinced him to stay for one more year. I'm almost 100% sure that they will sell him next summer and nothing after that, they want him to play in the CL so that his price will double. They know he's one of the biggest talents out there. An ideal mercato for Arsenal would be to get Baines, Gary Cahill,
Marvin Martin and Eden Hazard, that will surely make us forget all about Cesc and Nasri