SMS isnt a
vice Marchisio, hes a Pogba type btb mid, he wont play there in a 3 man midfield.
also, we dont even know if Mandragora and Bentancur will be with the team next season, they can both easily be loaned out. on top of that, we dont know if we will stick with the 4231, because of our transfer policy of looking for opportunities 1st, rather than going for a specific player, so if we can get both Tolisso and Sergej, we should do definitely. might as well see something like this next season
Dani Alves Bonucci Chiellini Alex Sandro
Tolisso Pjanic Sergej
Bernardeschi
Dybala Higuain
getting Sanchez and sticking with the 4231 would be good ofcourse, but there is no guarantee we will succeed in getting him