The 29-year-old England global was hurt during Liverpool's pre-season loss to Atletico Madrid on penalties in Munich on Wednesday. "So I think we can pretty much rule him out of August and September".
The loss of the 29-year-old leaves Klopp somewhat light in central midfield, with Jordan Henderson, Emre Can and Georginio Wijnaldum as recognised options in the position.
Last season the playmaker continued to showcase his talents throughout his 35 appearances across all competitions where he managed to net eight goals and provide seven assists.
Their coach Julian Nagelsmann, who turned 30 last month, is one of the most highly-rated young trainers in the game.
Klopp, whose side beat Crystal Palace 2-0 in midweek to reach the final, is still hoping to bring in Leipzig midfielder Nabi Keita, with Liverpool set to return with a final offer of around $97 million for the Guinea worldwide. Actually, it was exactly what I expected when I had a look - if there's a choice we always seem to take the German team!
"It was clear from the first moment when we knew who we could face that there would be no easy game".
"I'm excited. I'm happy that we can start". The game was not flawless with Liverpool's defence exposed in the first half but with the introduction of 10 new players in the second half, the game swung definitively in Liverpool's favour.
Liverpool manager Juergen Klopp is concerned about the prospect of Neymar moving to Paris Saint-Germain for a record transfer fee.
Klopp changed all of his outfield players at the half-time break and two of the youngsters introduced went on to play a starring role.
Klopp was in Munich for the Audi Cup pre-season tournament.
Liverpool must come through a tough two-legged play-off tie against Hoffenheim if they are to return to the group stage of the Champions League after a three-year absence, following today's draw.