"He (Salah) is sad about what happened but is totally focused on recovery, seeing when he can be ready," physio Ruben Pons told Marca.
"In principle it will be between three and four weeks, but we will try to reduce those dates -- that's the big goal."
Salah was hacked down by Real Madrid defender Sergio Ramos in the first half of the Champions League final in Kiev. He left the ground in tears as Liverpool lost 1-3.
Speaking after the game, coach Jurgen Klopp described it as a "really serious injury," but the Egyptian Football Federation said it was optimistic that he will be ready for their World Cup opener against Uruguay on June 15.
Egypt take on hosts Russia, on June 19, and Saudi Arabia, on June 25, in Group A.
Salah has travelled to Spain to undergo treatment, the Egyptian federation said.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
