Haha I agree the wording isn’t the clearest. Pretty sure though that ‘registered with UEFA’ just means when the player’s registered on the B List that season. And the fact that the OR statement mentions a loan implies to me that the condition of two years can’t include a loan.
This is what I normally use -
https://documents.uefa.com/r/Regula...League-2025/26/Article-31-Player-lists-Online
31.12 - A player may be registered on List B if he is born on or after 1 January 2004 and has, since his 15th birthday, been eligible to play for the club concerned for any uninterrupted period of two years, or a total of three consecutive years with a maximum of one loan period to a club from the same association for a period not longer than one year. Players aged 16 may be registered on List B if they have been registered with the participating club for the previous two years without interruption.
Phillips was in the first team squad last season for half a season. He has also had a season long loan.
He's certainly been eligible to play for the club through registration after the Blackburn transfer, even though we chose to loan him. Or has he?
This is how UEFA define eligibility:
30.01 - In order to be eligible to participate in the competition, players must be registered with UEFA to play for a club within the deadlines set out in these regulations, and must fulfil all the conditions set out in the following provisions.
30.02 - Each player must be duly registered with their national association as playing for the club concerned in accordance with the association’s own rules and those of FIFA, notably the FIFA Regulations on the Status and Transfer of Players.
30.03 - Each player taking part in the competition must be in possession of a player registration licence issued by the player's association or a valid passport or identity card, each containing the player's photograph and full date of birth (day, month, year). The referee or the UEFA match delegate may ask to see the passports/identity cards of the players listed on the match sheet.
So it looks like UEFA eligibility has checks back to local and FIFA processes. It doesn't state eligibility means you have to be available for selection for you current club on any given day though. It's about registration.