Victor Valdes admits Barcelona have taken "a backward step" after their 1-1 draw with Athletic Bilbao last night.
With Real Madrid defeating Villarreal 3-2, Barca have now slipped a clear nine points behind the leaders and Valdes lamented: "We must continue to fight in the three competitions we're in. But this is a backward step. We must rely on the leaders to lose and for ourselves to try and keep winning.
"Athletic Bilbao had one chance in the second-half and scored. They didn't create anything, but I admit they played well defensively.
"Today has been a sad day for us. We cannot give up, because there's still long way to go, but there's no doubt this cannot be repeated."
Barca teammate Andres Iniesta insisted: "We will never give up the Liga until it is mathematically impossible to win it. There are still many games left."