West Ham defender Reece Oxford is wanted by Red Bull Leipzig.
The 19-year-old has been on loan at Borussia Monchengladbach who are keen to sign him on a permanent deal.
Gladbach have yet to make a formal bid but Leipzig have made a proposal which would see them pay an initial £8million next month rising to £16m.
Manager David Moyes is open to Oxford returning and developing into a more valuable player for the club but there are concerns whether he has been focused fully on making his breakthrough at West Ham.