The 23-year-old was sent off for kicking out at Tino Costa which ultimately saw the Basque side suffer defeat to Los Che - an act which he later said sorry for on TwitterAthletic Bilbao midfielder Ander Herrera has apologised for his actions after the club suffered a 3-2 loss away to Valencia in La Liga on Saturday.
The Basque player was shown a red card midway through the second half for violent conduct, as Tino Costa and Nelson Valdez struck with two minutes to go, to reverse a 2-1 deficit into a home victory for Los Che.
The 23-year-old took to Twitter filled with regret and said sorry to his 230,000 followers, citing a "huge mistake" in the incident which led to his dismissal.
"I made a huge mistake, unforgivable for myself, I can only apologise and learn from mistakes. Thanks for the encouragement," Herrera tweeted.
He later echoed his sentiments to the media after the game at Mestalla.
"I've been a pardillo (naive or easily fooled) and I was wrong," the player told assembled reporters.
Marcelo Bielsa's men travel to France to take on Olympique Lyonnais in the Europa League on Thursday evening.