The Referees Committee appoints the referee team for each match. For each match, UEFA appoints a first and second referee and a third official. The host association must appoint an official timekeeper in the qualifying stage. If deemed necessary, the UEFA match delegate is empowered to use a neutral referee to act as a timekeeper at any time during the competition.
UEFA arranges for the referee team to arrive at the venue the day before the match, or two days before the finals. If a member of the referee team does not arrive at the venue by then, the UEFA administration and the teams must be informed immediately. The Referees Committee takes the appropriate decisions. If the Referees Committee decides to replace a member of the referee team, such a decision is final, and no protests against the person or nationality of the replacement are allowed.
If a first or second referee becomes unfit before or during a match and is unable to officiate, in principle the third official replaces him. This is decided on a case-by-case basis by the UEFA administration in cooperation with the Referees Committee. Such decisions are final.