Real Madrid want to get a deal for Paul Pogba done as quickly as possible and have set an ambitious deadline to get the transfer over the line.
United would be convinced into selling their record signing for an enormous fee, but Real Madrid are keen to not let discussions go on all summer.
The La Liga giants have set a deadline to get a transfer done of just two weeks from now, 1 July.
This is the date United players will have to return to training for preseason and Real are not keen for negotiations to last past then.
Real Madrid boss Zinedine Zidane is also keen to get Pogba on board for the clubs preseason trip to North America, which begins on 8 July in Canada.
The French coach sees the preseason camp as vital for the preparations for his first full season back in charge in the Spanish capital and wants any major signings involved.
Zidane is the driving force at Real to sign his compatriot, with reports suggesting that the board are more keen on other targets, but Zizou is pushing for Pogba.
United are reticent to sell the World Cup winner, but if a deal is to be done it is also in their interest for it to go through quickly.
Ole Gunnar Solskjaer will be looking to spend the huge transfer windfall on replacements, with