The Referees Committee appoints the referee team for each match. Only referees whose names appear on the official FIFA list of referees are eligible. The Referees Committee’s decision is final.
UEFA arranges for the referee team to arrive at the venue the day before the match. If a member of the referee team does not arrive at the match venue by the evening before the match, the UEFA administration and the teams must be informed immediately. The Referees Committee takes the appropriate decisions, which are final.
Any referee, assistant referee or video assistant referee who becomes unfit to officiate, or is otherwise incapacitated before or during a match, is replaced by another member of the referee team as follows, in accordance with the IFAB Laws of the Game:
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The referee is replaced by the fourth official or by the video assistant referee if one has been appointed and is available on-site, or by an assistant referee.
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An assistant referee is replaced by the fourth official or by the reserve assistant referee if one has been appointed.
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A video assistant referee is replaced by the assistant video assistant referee (if certified as video assistant referee) or by the referee if the latter is unfit to referee but able and certified to serve as video assistant referee.
If necessary, the match will take place without video assistant referees and/or without a fourth official.