I hope he comes back soon, because we need to start making some changes in front. Llorente and Tevez are doing all right, but they are getting predictable and might get injured from overplaying them. Vucinic is the only real alternative when in from imho.
I don't think we can sell Giovinco. He is also, it seems, 'a piece of art' owned by 'collectors', though what 'collectors' of such 'pieces of art' are called is quite another matter...
Quag won't bring more than 5-7m. Well, at least another salary is off the books, but he has experience at least.
SO, my point is, if we sell Vucinic we better be ready to change formations or splash big for another top striker. Neither of those are likely imho.