OK, lets give it a shot. Our current squad is just right in terms of numbers, so we can replace everyone 1 for 1 without having to leave out players from the CL list (well except for Rugani, but no one cares for Rugani). If we buy more than we sell, we have the same problem as last couple of seasons.
Szczesny, Buffon, Pinsoglio
De Ligt, Chiellini, Demiral, Bonucci,
Rugani
Cuadrado, Alex Sandro, Danilo,
De Sciglio
Matuidi, Bentancur, Ramsey,
Pjanic,
Khedira,
Rabiot
Ronaldo, Dybala, D. Costa,
Bernardeschi,
Higuain
imo the 7 ones in bold leave, so we can add 6 (again, not counting Rugani) more, without having to compromise the CL squad. I would also sell some others but i dont think we do that much of an overhaul.
Rugani should be leaving i think, but i wouldnt care if he stays as 5th choice either. Id sell Bonucci instead (or as well) and bring T. Silva for free (theres also Verthongen and Garay btw) for a year or two, but looks like thats not happening.
De Sciglio out means we need a fullback. Preferably a LB but Danilos ability to be equally useless on each side means its not necessarily a LB. Maybe we add 2 and use Cuads higher up most of the time again. There is Meunier whos a freebie so that could be the easy solution. That or we loan Emerson from Chelsea for the left side (or Kurzawa whos a freebie) and we good. Or both
In the midfield, Tonali i think is a safe bet to arrive. Just gonna say that Bonaventura is a freebie but Max isnt here anymore so thats a no

. I hope we get Pogba for LCM, if not him then Aouar. Id sell Matuidi as well, but dont think we sell 4 mids in one summer. 3rd mid to arrive could be
just Kulusevski, but it depends on if Sarri sees Bentancur as a DM or RCM. In which case we could be getting someone like Jorginho.
Berna makes room for Chiesa, or Willian if were broke (Kulusevski is an option as well, we dont know what Sarri plans for him are yet). Maybe D. Costa leaves and we get both. At CF i hope its freebie Cavani (i know, i know

), but imo its between Icardi and Milik depending on how much we can spend