Does Inter have a Sissoko? No, they don't. They have a Cambiasshole who can pass the ball. Does Bayern have a Sissoko? No, they have two good two-way CM's in VB and Bastian. Does Barca have a Sissoko? No, they don't. They have a Busquets who while being a limited player can at least make simple passes.
Sorry, but nobody needs a one-dimensional player like Sissoko. Anybody place a bid for him lately? Nope.
No, but fasting is quite unprofessional. No matter what the religious nuts claim, not having proper meals for a footballer or any athlete is detrimental. No doctor is going to tell someone who needs to lose weight to skip meals to accompany a work out. And they certainly wouldn't say that to an athlete who needs all the nutritional supplement he can get.