For each round of the competition in which an association is participating, it must provide the UEFA administration with a list of no more than 25 players (surnames, first names, club and date of birth) as well as the surname, first name, date of birth and nationality of the head coach. Three of these 25 players must be goalkeepers. This list must be completed online by 24.00CET on the following dates, with a signed print-out submitted by 12.00CET the next day:
5 January 2021 for the preliminary round mini-tournaments;
16 March 2021 for the main round mini-tournaments;
seven days before the first matchday in the final tournament.
Only 12 (final tournament:14) of the players on the list of 25 will be eligible to play in each round of the competition. The shortlist of 12 (final tournament: 14) players, two of whom must be goalkeepers, must be submitted online by 15.00CET the day before the team's first match in the preliminary or main round and two days before their first match in the final tournament. A signed copy of this list must be handed to the UEFA match delegate at the mini-tournament organisational meeting (or upon arrival in the case of three-team mini-tournaments) in the qualifying competition and to the UEFA administration at the heads of delegation meeting in the final tournament.
For identification purposes, UEFA match delegates may make a visual check of each player participating in the competition. As a rule, one such visual check takes place at a mealtime at the team’s accommodation before a team's first match in each mini-tournament and in the final tournament.
In mini-tournaments or the final tournament, a maximum of one outfield player named on the list of 12 (final tournament: 14) may be replaced by another player from the list of 25, upon submission to the UEFA match delegate of written medical evidence of illness or injury in one of UEFA’s official languages no later than 09.00CET on the day of the relevant match. The replaced player can take no further part in the tournament and no other outfield player may be replaced. In cases of particular hardship and upon reasoned request, the UEFA General Secretary may grant exceptions.
If an association cannot count on the services of at least two goalkeepers registered on the list of 12 (final tournament: 14) players because of injury or illness, the association concerned may temporarily replace the goalkeeper(s) concerned on the list of 12 (final tournament: 14) at any time during the competition, upon submission to the UEFA match delegate of written medical evidence of illness or injury in one of UEFA's official languages. The replacement goalkeeper(s) must be taken from the list of 25. Only if there is no eligible goalkeeper left on the list of 25 may another be registered. The association must provide UEFA with the necessary medical evidence. UEFA may require further medical examination of the goalkeeper(s) by an expert appointed by the UEFA administration at the cost of the association. Once an injured or ill goalkeeper is fit to be fielded again he can resume his position in place of his nominated substitute. Any such changes must be announced to the UEFA administration at least 24 hours before the next match in which the goalkeeper is due to play.
The associations are responsible for ensuring that the aforementioned provisions concerning player eligibility and lists of players are observed.