Crystal Palace are demanding huge money to sell Aaron Wan-Bissaka.
The Eagles want to stop a potential exodus at Selhurst Park with another star Wilfried Zaha determined to leave in search of Champions League football.
Wan-Bissaka, 21, has had a breakthrough season, featuring regularly for Palace after breaking into the first team at the beginning of the last campaign.
And his performances caught attention of top Prem clubs, with United planning a move for the youngster as Ole Gunnar Solskjaer plans a massive squad overhaul this summer.
But the South London side want to deter the Red Devils from snapping Wan-Bissaka by slapping a £60m price tag on the highly-rated defender.