Aké won't go as he's crucial to the 8 association trained.
(Bear with me here, it gets messy).
The PL allows clubs to register 25 players, with no more than 17 being non-association trained (not having been with English / Welsh clubs for 3 years before their 21st birthday).
Our (19) foreign association trained players are:
Ederson, Ortega, Nunes, Khusanov, Dias, Gvardiol, Akanji, Ait-Nouri, Rodri, Nico, Bernardo, Reijnders, Gundogan, Cherki, Savinho, Doku, Kovacic, Haaland, Marmoush
Consequently, we have only the absolute minimum of 8 association trained players, namely:
Trafford, Bettinelli, Lewis, Stones, Aké, O'Reilly, Bobb & Foden
So we can theoretically sell Aké (and go into the season with less than 25, as Pep has done before), but in any event we still need to sell at least 2 of the non-association players (or have them not be able to play in the PL, which I'm guessing neither we nor they would be happy with).
To buy both Rodrygo & Donnarumma (the latter of which I'm praying doesn't come), we'd need to sell 4 of our current crop (the reason why I'm guessing Akanji's name has started to pop up, but it'd still need us needing to sell - I'm guessing here - Ortega).
In any case, and back to the point, not only does he boost our HG/AT numbers, but if he's fit - in the event that Ait-Nouri was unavailable, I'd rather go into an important match with Aké than O'Reilly (who, for reference, is still listed as being a midfielder on the OS..... as, bizarrely enough, is Nunes).
And breathe (I haven't had a lot on so far this morning, can you tell ?)