Euzebio, who has earned a reputation for violent misdemeanours over the course of his career was dismissed for a kick-out at an Arsenal player, which caught the Argentine in the face.
“This cannot happen again,” said an irritated Abel Braga. “It could have cost us dearly.
“He has committed a foul, but it is the violence following that has cost us dear. It is injustifiable to finish a game like this with 9-men.”
The coach was clearly wound-up by the performance of his team, also taking issue with the supporters who booed the team at the end of the game.
In a typically hostile Libertadores encounter, Fluminense who second-best for the most-part and must look to perform better against disciplined defensive units, the likes of which they will face throughout the competition.