It just wouldn't be El Clasico without a fair share of controversy.

The La Liga title race has already been resolved, but there was no shortage of thrills and spills when Barcelona and Real Madrid exchanged blows on Sunday night. In the end, goals from Luis Suarez, Cristiano Ronaldo, Lionel Messi and Gareth Bale saw the affair finish level at 2-2.

However, the fixture went from zero to one hundred just before half-time when a scuffle between Marcelo and Sergio Roberto resulted in the latter being dismissed. 

After Marcelo pushed the Barcelona man, he appeared to slap in retaliation and referee Alejandro Hernández Hernández saw it all, brandishing the red card.

Ernesto Valverde reflected after the match: "There have been many controversial moments, I will have to see the replays to understand them more clearly.

Controversy in El Clasico

"Sergi Roberto's foul is strange, I'm surprised he's hit him in the face. I'll have to see it back on television."

That wasn't the only source of controversy in the first-half, though, with Bale coming in for great criticism after a terrible challenge upon Samuel Umtiti.

On another day, it could have been both a red card and a leg breaker but Bale escaped without a caution.

Ramos accuses Messi of pressuring ref

And, according to Sergio Ramos, these incidents led to a rather angry Messi at half-time.

The Real Madrid captain dropped a rather salty comment about Messi after the match, recalling what he saw in the tunnel during the interval. He even suggested that the Barcelona star's actions may have influenced the referee and, in turn, how the second-half unfolded.

Ramos stated at full-time: “Messi put a bit of pressure on (the referees) in the tunnel, I don’t know if there are cameras.

“I don’t know if in the second half it made them referee in a different way.”

That's a pretty serious accusation, Sergio.

Real were denied what looked a clear penalty during the second-half for a foul from Jordi Alba on Marcelo, and Ramos may feel that that very decision was influenced by the events of the break.

Of course, it's nothing out of the ordinary for players to have a word with the referee and we'll never know just how far Messi took things.

Officials will always be influenced by exterior factors from the crowd, the score and the players around them.

No matter who's in the wrong, though, it was honours even on the night.

Real may go onto to win the Champions League but Messi will sleep easy with the La Liga title and Copa del Rey as a silverware-fueled rebuttal. 

Do you think Ramos is telling the truth? Have your say in the comments section below.