Neither of the midfield pair were pictured in training on Wednesday afternoon and both have been left out of the travelling squad.
Jones was also absent for Liverpool’s draw against Luton at the weekend with ‘a minor fitness issue’, This Is Anfield understood.
Klopp has now provided an update, saying the 22-year-old’s issue is a hamstring problem. “Curtis had last week a hamstring, not massive.
“After international he will be back but not before. Low, low grade hamstring.”
The manager added: “When I took him off vs. Bournemouth he didn’t feel anything then I came in the dressing room and he said he felt something.”
He is also a doubt for Sunday’s match vs. Brentford, with Klopp explaining: “Ryan got a little niggle, knee. He was running today (Wednesday) already but there was no chance for this game.
“There is a chance for Brentford and he will definitely be back after the international break.”
With Dominik Szoboszlai having played more minutes than any Liverpool player this season except Salah, the Hungarian is due a rest.
An outside shout to come in is James McConnell, who made his debut in the final moments of the latest Europa League game at Anfield.