Mohamed Salah was forced off in the first half against Real Madrid, but his nation are confident he will bounce back in time for Russia
Egypt's Youth and Sports Minister Khaled Abd El-aziz said on his Facebook page: "It is expected Salah will need 2 weeks for treatment. He will stay in Liverpool and will have there the rehab period then will join the Egyptian team camp in Italy.
He added that Salah would be in Egypt's final World Cup squad which will be announced on June 4.
Egypt’s team doctor Mohamed Abou El-Ela said in a statement that, according to information from Liverpool’s medical staff, Salah has sustained only ligament damage and he remained optimistic he would still feature in the World Cup, a report from independent.co.uk said.
"During the telephone follow-up conducted by the national team delegation in Italy to check on the status of Mohammed Salah, Liverpool officials said Liverpool that X-rays were carried out on Salah's shoulder and showed that the injury was a shock in the shoulder joints," the Egypt FA signalled on Twitter.
"Dr. Abu Ela expressed his optimism that Salah to make the World Cup according to this diagnosis.”
Liverpool are yet to release an official update on Salah’s injury.
Klopp earlier told a post-match news conference: "It’s a serious injury, a really serious injury. He is in the hospital for an X-ray. It’s either the collarbone or the shoulder itself. It doesn’t look good, that’s it.
"We lost a very important player, like probably Egypt lost for the World Cup a very important player. I still hope it’s not like this," he said.
Salah's performances this term, following his move from AS Roma, have made him Liverpool's top performer and a national hero. Egypt will be at the World Cup for the first time since 1990 and face hosts Russia, Uruguay and Saudi Arabia in Group A.