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Jurgen Klopp revealed that Marko Grujic was sent to hospital after a sickening clash of heads in Liverpool' s 1-0 defeat to Chelsea.

The young Serbian midfielder was hurt in an aerial challenge with Bertrand Traore just before the break before being led away by concerned medical staff.

“In general the biggest problem for me is that Marko Grujic is in hospital,” Klopp said.

“He can't remember anything. That's not too cool for a young boy in this situation.

“Injuries happen in pre-season. It can happen. It's unlucky but it's not too good for us.”

In more positive news, Klopp revealed that Joel Matip is close to making a comeback after an ankle problem.

The former Schalke centre-back has missed the past two friendlies since going off against Wigan.

“Matip will be ready for the start of the season,” vowed Klopp.

“In the first two and a half weeks of pre-season he was really good. Now he's been out for a week.

“He trained today so hopefully he will be back in team training soon.”

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