The 20-year-old is understood to be weighing up his options at Man United after failing to find a place in Ruben Amorim’s preferred tactical system.
Several sides in the Premier League and abroad are interested in signing the England international, with Tottenham recently making an enquiry.
According to The Independent, United aren’t willing to sanction a sale of Mainoo this summer, although they understand the player’s desire for first team football.
Mainoo has two years remaining on his contract with Man United and talks over a new deal will likely depend on playing guarantees, although the club have the option to extend by a further 12-months.
