كتب : Omar AbdelAziz
The Egypt midfielder injured himself in the dying moments of Monday's 0-0 draw at Baladeya, which handed Ahli a fourth straight league title.
Reds boss Manuel Jose made sure everything is alright for Fathi before the latter's European trip.
"This is destiny, I could do nothing about it, and thank God for everything," said the 24-year-old.
"I want to thank the board and the coach for facilitating the procedures of my journey to Portugal.
"The coach talked to me and raised my morale by telling me that I will be back soon."
Jose's team faced a similar blow in 2006, when they missed the services of Angolan winger Gilberto for nearly two seasons with an Achilles injury.