A small tear in his medial meniscus had prevented the highly-rated Nigerian goalkeeper, from playing for the Gunners’ youth teams in the new season.
Ejeheri was fit enough to be included in the matchday squad, when Arsenal U18s thrashed Wolverhampton Wanderers 3-0 in their opening Premier League Cup match on September 28, but he did not take part.
The 16-year-old is now targeting a return to action in October.
Ejeheri is eligible to represent Nigeria, England and Uganda internationally, but has pledged his allegiance to the West Africans.
He was set to train with the Golden Eaglets in August, but was stopped by the injury.
