Manchester United striker Chido Obi is ineligible for their Europa League last-16 tie against Real Sociedad.
According to ESPN, manager Ruben Amorim did not register him for the competition.
Obi impressed as a substitute during United’s FA Cup elimination at the hands of Fulham on Sunday.
The 17-year-old, who joined from Arsenal in October, has now made just three senior appearances for the club.
His performance against Fulham led to questions for Amorim about whether he is close to earning his first start in place of under-pressure forward Rasmus Højlund, who has not scored since December.
However, Obi will not be available for selection in Thursday’s Europa League round-of-16 first leg against Real Sociedad, as he is ineligible to play in the competition.
United added January signings Patrick Dorgu and Ayden Heaven to their Europa League squad ahead of the knockout rounds, which begin with the trip to Spain this week.
Chido Obi was overlooked for registration as he was not considered a first-team player at the time.