Liverpool star Mohamed Salah is showing "mild" coronavirus symptoms after twice testing positive on Friday.
The forward missed Egypt's 1-0 win over Togo on Saturday after being force to self-isolate, having returned two positive tests ahead of the game.
Liverpool are next in action against Leicester City on November 22, with Salah's involvement now highly in doubt.
"He’s a mild case - he doesn’t have severe symptoms," Egypt team doctor Abou Elela told the Associated Press.
"He has to self-isolate in Egypt until his test returns negative and then, of course, he can travel back.
"The concerns from the Egyptian authorities are because Mo for Egypt is special. Everyone here wants to help and ... to do whatever the whole country can do."
Salah recently attended his brother's wedding, leading to speculation that fell ill after breaking coronavirus regulations.
Abou Elela added: "I cannot deny. No one knows because ... unfortunately, we still don’t know everything about the virus. My answer is maybe yes, maybe no."
