I would say Pogba. Bring him back and buy Tonali. Let Pogba, Benta, Rabiot, Pjanic and Tonali fight for the starting spot. Time to sell Sami, Emre and Matuidi. 5 players for 3 spots would be enough enough (especially since Ramsey can also play there and Bernagod too).
Being benched in a bad team allows for a neutral assessment of a player at worst. Firstly the player benched in a bad team hasn't contributed to the disaster unlike the players who weren't benched. Secondly, a fish rots from the head down so if the coach who is responsible for the shit situation chooses to bench a player it also speaks for the player. I hope you aren't confused by my big brain deductions.
probably a waste of time. im pretty sure, post 8 successive scudetti and higuaun clause activation, De laurentis would let Allan go to another club for free before taking money juventus.