Barcelona defender Pique bemoans missed chances in El Clasico defeat.

Barca defender Pique disappointed with defeat to Real Madrid. [Getty]

Gerard Pique labelled Real Madrid's first-half display as the worst he has ever seen in El Clasico despite Barcelona's anguish for their 2-0 defeat at the Santiago Bernabeu on Sunday night.

Real Madrid bounced back from their Champions League loss to Manchester City to leapfrog bitter rivals Barcelona in the LaLiga table.

It was Los Blancos’ first Clasico league victory in almost four years, thanks to second half goals from Vinicius Junior and Mariano Diaz.

Pique also admitted that Barca were far from their best as he bemoaned missed opportunities in the first half.

"Madrid in the first half was the worst Madrid I've faced at the Bernabeu," Pique told reporters after the El Clasico defeat. "We missed a chance to hurt them.

"We have to play better than in the second half, though. We lost balls and they grew in confidence.

"The feeling they [Madrid] transmitted was the worst, and I don't say it as a criticism. We all have problems in our clubs. But I have the feeling that it's an important missed opportunity.

"We are not very well, I say we lost the opportunity to hit the table. We had full control of the game. In the second half, we let them grow based on our losses and they scored a goal, and in the end the second one.

"It is a missed opportunity. In the first half, if we had taken advantage of several chances, we would have left with an advantage on the scoreboard."