Chelsea star Diego Costa has broken his nose

Hiddink revealed Costa suffered the injury after an accident involving a youth player and the Spaniard will wear a mask this weekend

Chelsea boss Guus Hiddink has revealed Diego Costa had his nose broken in training on Thursday.

But the Blues’ boss insisted the break came as a result of an accident involving Costa - who was embroiled in a bust-up with team-mate Oscar last month - and youth-team player

Fikayo Tomori.

Hiddink, whose men host Newcastle tomorrow, said: “The only thing is that, yesterday in training, Diego got in a duel and had his nose broken.

“It was not Oscar! It was one of the youngsters of the academy who we like to participate. It was not a tough duel, but he put his nose on the back of the kid's head.

“He was very unlucky and his nose was broken. He will return today. They'll try and give him a mask as well... we are a team with a lot of masks.”

Facial injury: Matic (pictured), Azpilicueta and Cahill have all worn masks this season

Tomori, 18, started every game as Chelsea's under-18s successfully defended the Youth Cup and the Canadian right-back featured in eight of the 10 UEFA Youth League matches on the way to victory in Switzerland.

He signed a first-year professional contract in July 2015, which commits him to the club until the end of the 2017/18 season.

Cesar Azpilicueta, Gary Cahill and Nemanja Matic have all worn masks after injuries this season. John Terry and Demba Ba are among the players that have worn one in previous seasons.

Hiddink added: “We are a Zorro team... Azpi, Matic, now Diego. He will come back and do some light training in the afternoon because he must experience how he deals with the mask. Then he will join us in the hotel later on.

“It was just a small incident, just a duel. But it's very fragile when you hit your nose on the back of the head of a firm young man. I think he will be available. We'll see how he reacts this afternoon in a very light session, but I hope – I'm not sure – that he will be available.”

It is the latest incident of an eventful season involving the striker whose form has improved dramatically since Jose Mourinho was sacked in December.

Before Mourinho’s departure Costa scored four goals in four months. Since the Portuguese was sacked Costa has netted seven goals in his last nine matches.

He was involved in the now-infamous bust-up with Gabriel which saw the Arsenal defender sent off in September. That decision was later reversed and Costa was instead banned by the FA.

Mirror Football also exclusively revealed details of the training ground bust-up between Costa and team-mate Oscar last month.

And Costa punched a hole in the Chelsea tunnel during the club’s 2-2 draw with West Brom last month.

Angry: Costa punched a hole in a wall at Stamford Bridge after Chelsea's draw with West Brom last month

Meanwhile Hiddink has revealed young academy star Jake Clake-Salter will be called up to the first-team squad after Kurt Zouma was ruled out for six months last week.

The Dutchman also has Gary Cahill and new signing Matt Miazga at his disposal.

He said: “[Matt] moves up, and also I have a kid from the academy [Jake Clarke-Salter] who is now with us.

“He is coming up from the academy, but also Matt who has been with us a few weeks already. In the first-team squad of 15 or 16 players, we can also make variations with Ivanovic, Baba Rahman and, Azpilicueta. We have some options to choose from.”