It means players like Ramsey, Rabiot, and Szczesny (obvious) have to leave.
Donnarumma at 12m, and the sum of those 3 players is something like 20m?
So the replacements of the two midfielders must be players that earn less, like Locatelli and another one.
Not taking the chance to sign Donnarumma would be a big mistake, particularly for free (comissions aside). Same as it was with De Ligt. Heavy prices but these are the absolute top talents in their positions. Or Håland, any club that could sign him should want to sign him.
Sadly I think he will renew with Milan.