Jordan Henderson is expected to miss around three weeks of action due to a hamstring injury, Jurgen Klopp says.
Henderson got injured in the closing stages of Liverpool's 1-0 Champions League defeat at Atletico Madrid on Tuesday night.
Klopp said the injury is not as bad as initially feared considering the other hamstring injuries which have hit their Premier League rivals.
He also does not expect to make too many changes for their game against West Ham.
"[Henderson] could have been worse. It was a hamstring [issue] and there have been a lot of different hamstring injuries around in the Premier League, Harry Kane for example," Klopp said.
"It's not that bad but he will be out for around three weeks or so. It is not cool but the way we see it, we were still lucky.
"I could [make changes for West Ham] because apart from Hendo, all the other boys are fit.''
A three-week recovery period will rule Henderson out of Liverpool's Premier League games against West Ham, Watford and Bournemouth, as well as the FA Cup fifth-round tie with Chelsea and likely the return leg against Atletico Madrid on March 11.