The Reds head into the new campaign with a host of injury issues, with a rigorous pre-season taking its toll on the first-team squad.
Caoimhin Kelleher will not be fit to take his place on the bench, however, with the Irishman “still a few weeks away” after arriving for day one of pre-season with a groin injury.
There are problems at centre-back, too, with Ibrahima Konate “out for a while” after sustaining a leg injury in the 3-0 friendly loss to Strasbourg on Sunday.
Liverpoool injury update
Kostas Tsimikas may be the next-closest to a return, the Greek having missed the last three friendlies due to a knee problem.
Klopp explained: “He might be ready, in his opinion anyway, to train next week.”
Keita, however, is expected to return to full training on Friday, with a view to being available for the visit of Crystal Palace on August 15.
“We hope with Curtis we caught it in the right moment,” Klopp said.
“That’s how it is with young players, they have some kind of stress reactions sometimes and they go over it because it’s no massive pain, but it could lead to something serious.
“We caught it early but still have to be careful now. That’s it with him, he’s not in.”