The Referees Committee appoints a referee for each match. Only referees from the official FIFA list of referees are eligible. The rest of the referee team is, in principle, proposed by the association of the referee, in accordance with criteria established by the Referees Committee. The host association may be requested to appoint referees. The decision of the Referees Committee is final.
UEFA arranges for the referee team to arrive in the country of the venue the day before the match. If a member of the referee team does not arrive by the evening before the match, UEFA informs the clubs immediately. The Referees Committee takes the appropriate decisions, which are final.
Any referee, assistant referee or VAR 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 the VAR 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 VAR is replaced by the assistant VAR (if certified as VAR) or by the referee if the latter is unfit to referee but able and certified to serve as VAR.
If necessary, the match will take place without VARs and/or without a fourth official.