How do European squad lists work?

Clubs must register a 'List A' and 'List B' squad.List AThis is the list that had the Wednesday evening deadline.List A contains a maximum of 25 players, with a minimum of eight 'locally trained' squad members. Of those eight, no more than four can be 'association-trained' instead of 'club-trained'.If the club doesn't submit eight locally-trained players, their maximum squad number of 25 is reduced proportionally. For example, should they only register six locally-trained players, their squad maximum becomes 23 players.There must be at least two goalkeepers registered in List A - and at least three in total across Lists A and B.List BThe only deadline for this list is that it must be submitted to Uefa no later than 23:59 CET the day before a match.There is also no upper limit to the number of players who can be on List B.This list caters for more junior members of a club's squad.A player is eligible to be on List B if they:were born on or after 1 January 2005 have been eligible to play for the club for two consecutive years since their 15th birthdayor have been eligible to play for the club for three consecutive years, including a loan spell within the same association, since their 15th birthdayPlayers aged 16 can also be on List B if they have been registered with the club for the previous two years uninterrupted.Players who changed clubs after participating in any Uefa qualifying rounds or play-offs are permitted to play for their new side from the league phase onward.After the September deadline, List A squads are locked in for the league phases of European competitions.However, should a club reach the knockout stages, they have until 23:59 CET on 4 February 2027 to register a maximum of three new players.There is again no restrictions on players that have played for another club during any stage of any European competition up to that point - if they have changed clubs in the January transfer window, they can play for their new team from the knockout rounds onward.The 25-player limit, and the eight locally-trained player minimum, remains in place.In exceptional circumstances of injury or illness, some further amendments can be made to List A.Up to and including matchday six of the league phase, a player who has been injured or ill for at least 60 days can be temporarily replaced by a player who was registered with the club before the List A deadline.The locally-trained quota remains the same, and if the affected player recovers before the end of the tournament, they cannot return to the competition.