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.
Juventus winning isn't something we can be very sure of again as this season they have just be drawing all their games. Milan isn't a small club that juventus can just win therefore, I think a draw again from juventus is what we should be expecting and even though juventus win, they still mightn't climb up the table as other clubs too are going to win their games and want to keep their position secured. Juventus next three games in the league are against Milan, Lecce and Bologna. Out of this three games I think only 7 points is possible for them as I expect there to be a draw in one of the games and I won't be surprised if they get a lost too as they haven't done so this season yet.