The full-back is hot property after a stellar season on loan at Sevilla, but is up for grabs again as Real Madrid are well stocked in the left-back department.
Reguilon is interested in the offer from United and is attracted to the idea of a long-term contract at Old Trafford and the prospect of playing Champions League football.
But Reguilon is aware if he joins United permanently it is unlikely he will re-sign for Real Madrid anytime soon and the Spaniard’s dream is to become a regular at the Bernabeu.
Reguilon is also at home in Sevilla and has an excellent relationship with head coach Julen Lopetegui and the current crop of players at the club.
Sevilla won the Europa League last season with Reguilon in their ranks and the player is confident the club will continue to take strides forward.
A loan switch to Sevilla would also leave the door open to a return to Real Madrid next year when a new manager could be in place.
Zinedine Zidane has so far snubbed the chance to bring Reguilon into the senior team, but the Frenchman’s long-term future at the club remains in doubt.