Marcelo insists Real Madrid will not give up on the title after defeat to Barcelona.
Barca are now four points clear at the top of the table.
"We played better in some parts of the game and we had more possession than them in the first half and at the beginning of the second half, but in the end they were better. It was a key game where we could have gone ahead of them, but there are games left and we are going to keep fighting," said Marcelo.
"We are never going to give in, we are going to keep battling, and be aware of our faults so that we do not make them again. Now we do not depend on ourselves and it is more difficult, but we are going to fight on until the end."