Hopefully we won't forget the need we have for a fullback, Darmian would be nice because he can play on both sides of the field.
I don't really feel the need to sign a pure LB, we have Evra who has done a great season, and Asamoah who I'm almost sure will end up playing that position. Having Darmian would allow us to rotate him with Licht, and use him on the left in case of emergency.
We should get rid of Cáceres before it's too late, he's not good enough as a RB imo and he also isn't good enough as a CB on a line of 4, considering we already have Bonucci, Chiellini, Barzagli and Ogbonna, and we're about to get Rugani, he won't have a place to play unless it is as a RB, and as I've said, he's just not that great as Darmian. And we also have to wait and see what will happen with Romulo.
Allan/Witsel isn't that much of a need right now, but if we don't sign a CAM (Pereyra) or a LB (Asamoah), and Padoin leaves, then I could see us signing him, then maybe we could rest Marchisio a little bit.
I don't know what Allegri is planing with Tevez, Dybala and Morata, then the rumors for Cavani (unlikely). But if we continue to play 4-3-1-2 then a CAM is a major priority, but there aren't any rumors about us signing one.