Before each match, each team shall indicate in the relevant match sheet the numbers, full names, dates of birth and, if applicable, shirt names of the 23 players in the squad, together with the full names of the officials seated on the substitutes’ bench and on the additional technical seats. Goalkeepers and team captain must be identified. Players must wear the shirt and short numbers as indicated on the match sheet.
The 11 players indicated on the match sheet as forming the starting 11 must commence the match. The other players are designated as substitutes.
Each team must have its match sheet validated by its competent association official and submit it at least 75 minutes before kick-off.
Up to five of the substitutes listed on each team's match sheet may take part in the match. Exceptionally, a sixth substitute listed on the match sheet may take part exclusively during extra time. Each team may use a maximum of three stoppages in play to make substitutions (one additional stoppage in extra-time can be used). Substitutions made before the start of the match, during half-time, between the end of normal playing time and extra time, and at half-time during extra time do not reduce the number of stoppages in play that can be used. A player who has been substituted may take no further part in the match. These provisions are subject to the maximum number of substitutions authorised by the IFAB Laws of the Game.
After the validated match sheets have been submitted no changes are allowed. Before the match has kicked off, the following exceptions are possible:
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If any of the players indicated on the match sheet as forming the starting 11 cannot start the match due to physical incapacity, they may be replaced by one of the substitutes listed on the match sheet. The replaced player is taken off the match sheet and the team's quota of substitute players is reduced accordingly for the match in question. During the match, five players may still be substituted.
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If any of the substitutes listed on the match sheet cannot be fielded due to physical incapacity, they may not be replaced, which means that the quota of substitute players is reduced accordingly for the match in question.
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If none of the goalkeepers listed on the match sheet can be fielded due to physical incapacity, they may be replaced by goalkeepers not previously listed on the match sheet, subject to final approval by UEFA.
The association concerned must, upon request, provide the UEFA administration with the necessary medical certificates.