Its not necessarily spending power:
Pjanic, 30, 6,5m - Arthur, 23, 5m
Rugani, 25, 3,5m - Romero, 22, 2m
Higuain, 32, 7,5m - Milik, 26, 5m
Bernardeschi, 26, 4m - Kulusevski, 20, 2,5m
Khedira, 33, 6m
Perin, 27, 2,3m
De Sciglio, 27, 3m - Some youth player
Pjaca, 25, 2m
Contract: Dybala from 7,3m increase to 12m
~42,1m net spend on those wages to ~26,5m net
So let’s say we used the money for Arthur with Pjanic and Muratore. Kulusevski got signed in january when Can, Han and Mandzukic left.
With a straight swap between Berna and Milik, we still have Pjaca, Higuaín, De Sciglio, Rugani and Perin to sell (and Costa, Matuidi, Ramsey but I doubt they’ll leave).
At this point we haven’t spent a euro and depending on our financial situation, there’s still a lot possible. But we’re (seemingly) doing good business with lowering the wages and average age. Less wages = more spending power imo.