Marcelo Bielsa apologised to referee Alejandro Hernandez after being sent off, whilst Michel Gonzalez criticised his players.
The Argentine Coach was sent to the stands after protesting a contentious decision in his team's victory at San Mames, but has admitted he was wrong to call into question the referee's integrity.
“There is no reason to protest as I did,” he told a Press conference. “I want to apologise to the referee and his assistants.
“I claimed that there was a handball and that is not in the regulations.”
He also commented on the gesture made by his opposite numbe, as the Sevilla boss tried to speak in favour of the former Chile man.
“I have seen the gesture made by Michel. It was an act of chivalry, and I want to thank him for that.”
A late Alvaro Negredo goal meanwhile, was not enough for the Andalusians, and MIchel was clear who was to blame for the defeat after the game.
“My team has issues that have to do with morals and respect for the shirt,” he told a Press conference. “No matter what we do, if it is not done with interest, then it is bound to fail.
“I hesitate to describe our performance in case I get angry. In the first half we didn't concentrate, were disorderly and lost possession.”
Herrera sent off 76 (Athletic Bilbao)