Birmingham City do have a sell on clause associated with Jobe Bellingham.
The 18-year-old is now at Sunderland and has been impressing in the Championship.
The younger brother of Real Madrid's Jude Bellingham, he is attracting Premier League interest, says the Daily Mail.
Crystal Palace and Brentford are among the teams willing to bid for him this off-season.
Birmingham, who are now down in League One, will get a decent chunk of the fee that Sunderland can secure.
Another who may be leaving Sunderland in the summer is Jack Clarke, who Southampton and Brentford both want.