Liverpool midfielder Thiago Alcantara's hamstring injury is "not good", but boss Jurgen Klopp hopes the Spaniard will be fit to return in a month.
Liverpool are already without midfielders Curtis Jones and Alex Oxlade-Chamberlain.
"We have injuries, that's how it is. It is a question of how long will the players be out," said Klopp.
"Thiago is good but the injury is not good. I read four to six weeks. I would prefer four."
Klopp, whose team visit Crystal Palace on Monday (20:00 BST), said there were "different solutions" to his early season injury problems.