Kobbie Mainoo could follow Alejandro Garnacho in leaving Manchester United, with clubs across Europe alerted to his availability this summer.
Five Premier League teams have considered making an approach for the 20-year-old, including Aston Villa, Brentford, Chelsea, Fulham and Tottenham Hotspur.
Atletico Madrid, Real Madrid, Juventus and Napoli are also monitoring the situation.
The i Paper understands Mainoo has not told United he wants to leave directly but several sources have indicated he is keen to play in the Champions League.
A departure before Monday’s deadline day remains unlikely at this stage, insiders said, given United would have little time to bring in a replacement.
The latest on Garnacho
The news comes as United have finally reached an agreement with Chelsea for the