Lionel Messi said he is worried about facing Real Madrid on December.
Barcelona are leading the La Liga table with 34 points, while Real Madrid is standing on the second place with the same result.
Messi has revealed El Clasico would be a serious test for the club.
He told:
"I expect a very strong Real Madrid. They have shown it in the last matches, in La Liga and in the Champions League. Barca v Madrid and Madrid v Barca are always special matches. It doesn't matter how the teams arrive, although it's true that we both go into it at a good time. Everything is becoming more and more even. They have been for several years and we notice that there is more equality, that any team beats any other team, which is increasingly difficult to play as an away team. The teams have become stronger at home because they know that in order to achieve their goals they must do it well at home. This makes everything more equal and more complicated."
La Liga giants will face each other on December 18.