Ernesto Valverde, Sergio Busquets and Arturo Vidal were unanimous in criticising the decision to send off Barcelona defender Clement Lenglet after a VAR review in Sunday's 2-2 draw against Girona.
Lenglet was dismissed during the first half of his maiden La Liga appearance for Barca after clashing with Pere Pons, with Girona striker Cristhian Stuani striking twice to turn Sunday's game around at Camp Nou.
Replays indicated Lenglet caught Pons with his elbow but, despite Gerard Pique's header salvaging a point for last season's champions, Valverde was unhappy with the decision.
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"The red card changed the game," said the head coach, whose side remain above Real Madrid at LaLiga's summit on goal difference.