Salah was forced off in the first-half of Saturday's Champions League final between the two clubs, with Liverpool going on to lose 3-1.
The FIFA World Cup is scheduled to begin on June 14, as 32 teams battle for honors in the World's biggest football tournament.
The 25-year-old struggled on for a few minutes, before leaving the pitch in tears as the pain came unbearable.More news: Bollywood star Arbaaz Khan summoned by Thane Police in IPL betting scam
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Salah has flown to Spain to undergo treatment, accompanied by doctors from both Liverpool and the Egyptian national team.
Liverpool forward and player for Egyptian national team Mohammed Salah took to Twitter to update fans on his condition.
Liverpool manager Jurgen Klopp while talking about Ramos' injury said, "He would have played on if anything was possible".
Zidane revealed he broke the news of his departure to captain Ramos first.
Egypt's World Cup campaign begins against Uruguay on June 15, before games against Saudi Arabia and the host nation, Russia.
We're just six days on from the Champions League final and many around the world will still be seething with Sergio Ramos.