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 disciplinary bodies are entitled to augment this punishment, including by extending it to other competitions.
In case of repeated yellow cards:
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in the qualifying competition, players and team officials are suspended for the next competition match after the second and fourth yellow cards;
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in the final tournament, players and team officials are suspended for the next competition match after the second yellow card.
Single yellow cards expire on completion of the preliminary round, but pending yellow-card suspensions are carried forward to the main round.
Yellow cards and pending yellow-card suspensions expire on completion of the qualifying competition and are not carried forward to the final tournament.
In the final tournament, yellow cards that have not resulted in a yellow-card suspension expire on completion of the group stage and are not carried forward to the semi-finals.
Single yellow cards that have not resulted in a suspension and pending yellow-card suspensions expire on completion of the competition.