The No.20 sustained a thigh problem while on international duty with England and will now be sidelined for a number of Reds games in the run-in, beginning with Saturday’s Merseyside derby.
“It’s hard for us, of course,” Klopp told Sky Sports.
“How it is in this moment in the season, if you lose a player for three or four weeks, it’s around about eight games – or six or seven games. It’s a lot and it’s hard.”