Chelsea boss Guus Hiddink has been explaining the incident that saw Diego Costa break his nose in training after going for a header.
"Diego got in a duel on the pitch, got his nose broken," said Hiddink. "It was one of the youngsters in the academy, we like them to participate in the game. Diego put his nose on the back of the player and was very unlucky.
"His nose was broken, but he will return today, he will have a mask on. We are a team of a lot of masks - we're a Zorro team. Azpi (Cesar Azpilicueta), Matic and now Costa.
"He will come back in the hotel later. It was just a very small incident, it was nothing. I think he will be available, I hope, I'm not sure, but I think he will be available."