Salah pulled a goal back for Egypt in the 72nd minute with a powerful strike from the penalty spot after the Liverpool man was fouled inside the area following a review from the Video Assistant Referee (VAR).
Salah started in Egypt's second World Cup clash with Russian Federation on Tuesday, the first time he has played since injuring his shoulder in the Champions League final with Liverpool.
The arrival of Egyptian celebrities in Russian Federation to cheer for the country's national football team at the World Cup has stirred controversy among Egyptian fans and sports commentators, who have expressed worry that the celebrities' presence could have a negative impact on the players' focus. The host country enters on the heels of a 5-0 shellacking over Saudi Arabia; a tremendous result that ended a very long losing streak.
The seven-time African Cup of Nations winners sit in third place in Group A with no points so far having lost their opening game 1-0 to the Uruguayans.
It looks like one of the world's best players will be leaving the World Cup early.
"Nobody can argue about Salah's importance to the team and we've been anxious since he got injured and it would have been preferable to have had him at our training camp in the build-up to the tournament", Cuper said.
But the shoulder injury sustained in the Reds' Champions League final defeat to Real Madrid derailed preparations, meaning Salah was reduced to a watching brief as Group A started with a late defeat to Uruguay.
"He's a great player, a crucial player, that much is perfectly clear", Cuper added. Let us know in the comments.
"He wasn't in all the preparation with us and that cost him a little bit of his physical ability", Cuper said.
"I don't think it was lack of concentration, we did make mistakes and were not good at defending, but we had a really good first half", said Cuper.
"We've done something historic but the tournament isn't over", he said.
"Whether I should stay or not does not depend on me and we still have another match". We expect at least one goal from Egypt. Bet the over.