Manchester United may consider taking young Real Madrid striker Borja Mayoral as part of any deal to sell David De Gea to the Spanish giants, sources have told ESPN FC.

De Gea's future at United has been uncertain this summer with Real chasing the Spanish goalkeeper's signature.

United are refusing to let De Gea, who is entering the final year of his contract, leave for less than the record fee paid for a goalkeeper when Gianluigi Buffon joined Juventus from Parma for £32.6 million in 2001.

United also wanted Sergio Ramos in exchange for De Gea, but that fell through after the defender signed a new long-term deal at the Bernabeu.