Chelsea interim boss Guus Hiddink has played down allegations of a training ground spat involving Oscar and Diego Costa that involved raised fists.

The pair had to be restrained on Thursday after Oscar made 'a particularly strong tackle' on Costa, with team-mates and coaching staff calming tempers.

Hiddink said: "It was a pity that our photographer had a day off because he could have shot beautiful pictures of two bulls bumping chests.

"[Costa] took a charge from behind and it was overdone. They stumbled over the ground, stood up and then chested a bit without any further threat of punching.

"We had an intense, very sharp training session so things were close, on the edge, and these things can happen.

"Oscar apologised in front of the group. They looked at each other and then they started laughing. Jokes were made already afterwards so it's a battle which can happen when you are used to playing at high intensity."