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 card;
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in the final tournament, players and team officials are suspended for the next competition match after the second yellow card.
Yellow cards that have not resulted in a suspension and pending yellow-card suspensions expire on completion of round 3 and are not carried forward to the final tournament.
In the final tournament, yellow cards that have not resulted in a suspension expire on completion of the group stage. They are not carried forward to the semi-finals or to any FIFA U-20 World Cup play-off matches.
All yellow cards and pending yellow-card suspensions from the final tournament expire on completion of the competition.