The news means that the Red Devils will be without their top scorer in the Egyptian Cup campaign as he could fly to Germany for treatment.
Meteb enjoyed a fine season with Ahli, scoring some decisive goals for the club.
His last goal was the opener in a 3-0 Champions League win over Ittihad Tripoli, three weeks before he had netted a brace in the Cairo derby against Zamalek.
"The players' safety comes first. We will miss Meteb a lot, but we have to think for alternatives," Ahli boss Hossam Al-Badri said.
Meanwhile, Algerian starlet Amir Sayoud will not take part in the cup campaign as he will join his nation's Olympic team this month.
The 20-year-old finished a fruitful loan spell at Kuwait's Al-Arabi, but Al-Badri stated that he accepted the player's request of going on international duty.