https://juvecanal.com/articles/juventus-wages-successfuly-lowered/
frabotta is missing from this list, the guy based his calculation only on the net wages and assumed we'll save the whole yearly salary, still, that's a start. btw a precise calculation is fairly complicated, since the players get paid monthly, and some of their yearly salary was already paid by the club. so for instance, in de sciglio's case, his yearly net salary is 3m, but his salary for the first 3 months of the financial year was already paid, so the saving is "only" 2,25m net, a bit less than 3m gross. and since it's a dry loan, his amortization (~2,5m) will still count.