Manchester United fear teenage prodigy JJ Gabriel could join rivals Manchester City after reportedly asking to leave the club.
The 15-year-old is regarded as one of the most promising young players at United, but his reported decision has raised the prospect of a move across Manchester.
Real Madrid are also said to be among the European giants monitoring Gabriel and ready to make a move for the teenager.
United now face competition from both City and the Spanish club as uncertainty grows over Gabriel’s future.
