Just watched the latest Inside City episode. We really don't need to fret at all. The squad is superb as it is. Walker looked happy, Bernardo looked happy, Laporte looked happy. The only one who looked miserable was Cancelo - but I think that's just his general persona and is the most likely to go.
If the squad stayed the same with Gvardiol coming in, just look at the options
Ederson (Ortega)
Stones (Walker, Lewis, Akanji) Dias (Akanji, Laporte, Ake) Gvardiol (Ake, Laporte, Lewis)
Rodri (Kovotic, Phillips, Stones, Lewis)
De Bruyne Foden (Bernardo, Kovotic, Palmer, Alverez, McAtee)
Bernardo (Foden, Palmer, Alverez) Haaland (Alverez) Grealish (Palmer, Foden, Alverez, McAtee)
That's 21 quality players. More than enough. Obviously if anyone leaves we'll need to, and almost definitely will, replace them with quality. That defensive unit is the the best I've ever seen. If I was to sign anyone it'd be a creative Mid or winger, but I wouldn't be going for someone who isn't on the same level as the others just for the sake of it eg. Raphinah, Olmo. If a DeJong, Kimmich, Sane became available then happy days but if not, then we still have the best squad in the world