Manchester United have had a bid rising to £50m rejected by Crystal Palace for right-back Aaron Wan-Bissaka, Sky Sports News understands.
It is understood the bid was worth an initial £35m, with additional payments totalling to £15m.
Palace are understood not to be happy with the structure of the proposed deal, but it is believed they would accept an offer of between £45m and £50m up front for the England U21 international.
Although Wan-Bissaka favours a move to Old Trafford, he has not put in a transfer request or agitated for the switch.
Palace are under no pressure to sell the 21-year-old, who featured 39 times in all competitions last season as the Eagles finished in 12th place.
Wan-Bissaka has three years remaining on his contract at Selhurst Park.
United manager Ole Gunnar Solskjaer is keen to bring in a right-back this summer following the departure of club captain Antonio Valencia.
Follow the Summer Transfer Window on Sky Sports
As well as keeping an eye on Sky Sports News, make sure you don’t miss a thing with our dedicated Transfer Centre blog.
There’s also the return of the Transfer Talk Podcast, the daily UK, Regional and European Paper Talk, plus features across SkySports.com and the Sky Sports App.