Marc Cucurella can only transfer to Manchester United if the Red Devils are able to offer a higher price than Chelsea is currently willing to accept.
The value placed on a loan agreement for the Spaniard by the two clubs differs by £5 million.
On Tuesday, Manchester United presented a proposal to sign the defender on a season-long loan.
The 25-year-old is welcome to leave Stamford Bridge this summer, but Chelsea demands that his salary be paid for and that a £7 million loan fee be paid.
In 2022, Cucurella moved from Brighton to Chelsea at a cost of £62m.
Chelsea has rejected the £2 million offer from Manchester United for the fullback.
The two clubs are attempting to come to an agreement through negotiations.
The Spaniard is eager to join Erik ten Hag’s Red Devils after leaving Chelsea.