Liverpool manager Jrgen Klopp confirmed that midfielder Ryan Gravenberch suffered a hamstring injury on Sunday.
The Reds played out a 0-0 draw with Manchester United at home in the Premier League.
Gravenberch, who was impressing in the contest, had to come off on 61 minutes.
Klopp told his post-match press conference: We will see. They told me directly after the game it got worse during the game, so that means it was not 'bam'. He felt a little bit and didn't show immediately.
We hoped it would go by, [but] it didn't. There was this really intense sprint with the ball which ended on the 18-yard line with a collision.
I hope it is not that serious but we have in the next 10 days three more games, so I don't know if he will be part of them or one of them. We will see, we have to make a scan."