Summer signing Toby Collyer has been training Manchester United's senior squad this week.
The Manchester Evening News says the midfielder was signed from Brighton back in March.
The highly-rated teenager has captained England at U16 and U17 level and left Brighton after failing to agree terms on a new deal with the club.
Collyer, 18, is yet to feature for United U21s this season, although he has been on the bench for the last two games.
Youth Cup winning trio Rhys Bennett, Marc Jurado and Sam Murray were also involved, as was youth team centre-back Bjorn Hardley.