I’d say that also thin in the RM/RWB and LM/LWB positions if we were to play with 3 at the back… this unless anybody really considers DeSciglio,Danilo,Alex Sandro or Pellegrini as capable options of replacing Kostic and Cuadrado in the same roles, i think the 3-4-3/3-4–1(Pogba)-2 will be only a back-up solution on certain occasions for now.
Thing is that will see plenty of hybrid formations i’m sure because this squad is not properly equipped with depth for any exact formation but rather for a mixture of them, hopefully Allegri will somehow manage to find the right formula.