UEFA announced players could receive yellow cards, not red cards, for covering their mouths during Champions League and Europa League matches.
https://www.foxnews.com/sports/major-soccer-governing-body-nixing-fifas-mouth-covering-red-card-mandate-future-games
https://www.foxnews.com/sports/major-soccer-governing-body-nixing-fifas-mouth-covering-red-card-mandate-future-games