Ramos: Messi put pressure on the referee at half time of El Clasico LaLiga- Barcelona 2-2 Real Madrid Real left frustrated by refereeing in the second half

Barcelona finished the first half of Sunday's Clasico with ten men after Sergi Roberto was sent off, leaving the hosts livid and Sergio Ramos accusing Lionel Messi of putting pressure on referee, Alejandro Hernandez Hernandez, during the half time break.

What followed was a number of decisions which infuriated Los Blancos, especially when Messi himself scored a goal after what appeared a clear foul by Luis Suarez on Raphael Varane.

"Messi put pressure on the referee in the tunnel at half time," he explained in his post-match interview.

"I don't know if there were cameras, and I don't know if he would have made other decisions in the second half.

"However, it's important to leave these things on the pitch, you have to show respect."

Tempers continued to flare in the tunnel just prior to the resumption of hostilities with Gerard Pique appearing to antagonise Nacho Fernandez.

The veteran defender appeared to whisper something in Fernandez's ear, sparking a furious reaction from the 28-year-old, something which Ramos himself then made a brief attempt to mediate.