As a rule, a player or team official sent off by the referee is automatically suspended for the next match in the competition. In the event of a serious offence, the UEFA Control, Ethics and Disciplinary Body is entitled to augment this punishment, including by extending it to other competitions.
In case of repeated cautions:
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before the group stage, players and team officials are suspended for the next competition match after two cautions, which did not result in a red card, as well as after the fourth caution;
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from the first match in the group stage, players and team officials are suspended for the next competition match after three cautions, which did not result in a red card, as well as following any subsequent odd-numbered caution (fifth, seventh, ninth, etc).
Single yellow cards and pending suspensions are always carried forward to the next stage of the competition.
Exceptionally, all yellow cards and pending yellow-card suspensions expire on completion of round 2. They are not carried forward to the group stage. In addition, all yellow cards expire on completion of the quarter-finals. They are not carried forward to the semi-finals.
Cautions and pending yellow-card suspensions expire on completion of the competition.