A win is a must for Juventus. They can easily climb up as long as they take three points from Milan soon. They shall focus on how to beat their next opponent, and may be struggle to do that.
Juventus's gap to the Napoli is very thin. They can climb to the first position when their opponents will miss three points soon.
I haven't seen a rumor about Juventus's January transfer to buy a new player, but they will sell Fagioli for 25m.