Benfica lodged the complaint regarding an incident in the 82nd minute where Valverde clashed with their player Samuel Dahl near the sidelines. The Portuguese club claims Valverde took a punch at Dahl to get free, an act they believe deserved a red card, though it was not reviewed by VAR.
It remains to be seen what comes of the appeal, but it is highly unlikely Valverde's participation in the second leg will be threatened. The stage is set for an enthralling and high-tension second leg next week.