With Pogba signing a new deal which takes him to 2019, I cannot see him going anywhere, especially not unless its for a world record sum.
However, there were a lot of words exchanged between Vidal and the Juve chairman over the summer, I dont think there is much love lost between those two, so he could definitely be someone who is available in the summer. It would take a lot of money and there would be an auction for him, but IMO he is the one signing I would love. We need to keep improving the squad, case in point is Chelsea, (Matic, Fabregas, Costa) are 3 very good additions