As it stands: Ederson, Ortega, Gomez, Lewis, Walker, Dias, Ake, Stones, Akanji, Laporte, Phillip's, Rodri, Kovacic, Perrone, Mahrez, Palmer, Foden, De Bruyne, Grealish, Bernardo, Alvarez, Haaland
22 players there, plus any I might have missed. As it stands there's no room for any more incomings unless we sell first. That's my take on it
When do we have to register squads for PL and CL? For PL isn't it the end of each transfer window? There really isn't any concern about squad places until we get to that point, particularly when Perrone & Palmer are earmarked for loans, Gomez could be moved to Girona, Laporte will almost certainly move and Walker & Mahrez likely to go as well.