Egypt faces host Russian Federation in St. Petersburg on Tuesday, and then take on Saudi Arabia on June 25 in the team's final group stage match.
FC's Shaka Hislop is shocked Egypt's Mohamed Salah didn't feature against Uruguay, who capitalised late to keep pace with Russian Federation in Group A.
Jose Gimenez's towering header broke the hearts of Egyptians as Uruguay defeated a Mohamed Salah-less Egypt. However, he was missing from the starting 11 named on the team's official Twitter account, which showed Marwan Mohsen leading the attack.
Egyptian defender Ahmed Fathy and Uruguay's Luis Suarez vie for the ball in their Group A opener in Yekaterinburg on Friday.
"He was fit to play against Uruguay but the coach did not want to take the risk", said the EFA.
"We have played against the likes of Messi, Neymar and others".
"Mo Salah is an important player for us, that is without a doubt", Cuper said.
"I can nearly assure you 100 per cent he will play, save unforeseen circumstances at the very last minute", said Cuper.
Cavani celebrates Uruguay's goal.
However, pictures have emerged from Egypt training showing Salah's team-mates helping him put on a t-shirt, adding to the mystery over his fitness.
"This is football, in our history of football", Tabarez said.
If Suarez and Co. beat Egypt in front of Yekaterinburg Arena's curious two temporary stands they will finally banish Uruguay's unwanted recent record - they have not won their opening game at a World Cup since 1970.
The win ensured that Uruguay moved to the second spot in Group A with three points, behind log leaders and tournament's hosts Russian Federation only by a superior goal difference.