Jurgen Klopp says he has "no idea" when Daniel Sturridge will be fit enough to return to the Liverpool squad.
Sturridge has missed three games with a calf injury which has also kept him out of training, and the England international will be sidelined for at least two more - starting with the Super Sunday visit of West Ham.
Speaking at his press conference ahead of that game, Klopp said: "Hopefully he will be back as quickly as possible, but I have no idea.
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"I can't make pressure with making timelines. He is not in training with the team at the moment so we don't have to think about him for the team with West Ham and Middlesbrough but maybe then.
"What's the game after Middlesbrough? Everton? Oh! That would be nice, but I have no idea.
"Until now he hasn't trained. He will be on the pitch today but that means starting the work. He won't be with the team.
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"He's not happy. That is the life of a footballer. You can't force these things."
Liverpool go into the weekend on the back of last Sunday's 4-3 defeat at Bournemouth, where they threw away a two-goal lead in the closing stages to lose for the first time since August.
Klopp again defended goalkeeper Loris Karius, who spilled a Steve Cook shot to hand Nathan Ake Bournemouth's winner, and predicted an "angry" response from his side this weekend.
The Reds boss said "eight other players" were as responsible as Karius for Ake's goal, adding: "Even the best goalkeepers in the world make mistakes. David De Gea made one similar recently.
"We live in a public world, everything is interesting and we have to deal with pressure. Shut your ears, I would say, it helps a lot. I'm quite good at this! Hopefully he can adapt to my skills!"
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