Barcelona coach Ronald Koeman was pleased with Ansu Fati's performance in defeat to Real Madrid.
Koeman stressed that he was happy with Fati's display despite the youngster not having contributed much in the Clasico.
"[Ansu Fati] played his game," said Koeman.
"He worked to help the team. He had a chance in the first half, but they defended well. I think the discomfort he feels has nothing to do with his knee. I don't think it's serious.
"He played 70 minutes and it is a lot for him, and he has to rest to be fine against Rayo [Vallecano]."