Madrid: Real Madrid captain Iker Casillas slammed his side's performance after they let a two-goal lead slip to lose 2-4 at Real Sociedad.
Real Madrid's Iker Casillas (right) reacts after midfielder Esteban Granero (third from right) scored Sociedad's fourth goal at the Anoeta Stadium yesterday. Pic/AFP
"What happened was very unusual, especially after the first 15 minutes. After that everything was negative, we were horrible in every facet," he said.
"We can't lose a game in this way. We have to accept the defeat and the criticism and learn from what happened."
Real looked well on course for victory in San Sebastian thanks to early strikes from Sergio Ramos and Gareth Bale.
However, Sociedad were level before the break as Inigo Martinez made the most of some slack Madrid marking from a corner before David Zurutuza bulleted home a header from Alberto de la Bella's cross.
And there was more of the same to come in the second-half as Zurutuza put Sociedad in front before Carlos Vela rounded off the scoring.
"We have started the season and it is clear that we need to correct a lot of things," added Casillas. "We need to keep going because we are wearing a very important crest on our shirts and that is not the example to show to the world."
The visitors were without the injured Cristiano Ronaldo and departed Angel di Maria and Xabi Alonso.