The 26-year-old forward was forced off the pitch in the early stages of Egypt's FIFA World Cup qualifying match against Burkina Faso. Initial scans performed in Egypt have indicated that he will not be available for Sunday's derby. Marmoush has now returned to Manchester to undergo a more detailed assessment and begin his rehabilitation.
Marmoush's absence will be keenly felt by Manchester City, as he had featured in all of their Premier League fixtures so far this season. The injury adds to the club's growing list of fitness concerns, creating a new challenge for the team ahead of one of the most anticipated matches of the season.