The speculation surrounding the France international is gathering pace, with his agent Mino Raiola continuing to speak publicly about the World Cup winner's future.
Juventus are thought to be determined to re-sign the 26-year-old during this summer's transfer window, but Madrid have also long been credited with an interest.
According to the Daily Mail, Zinedine Zidane's side are interested in a deal for the central midfielder, but the Spanish giants would not be prepared to pay more than £50m to sign him.
Pogba has only made eight appearances for the Red Devils this season due to injury and is currently on the sidelines recovering from an ankle operation.
United are thought to have placed a value of £150m on Pogba last summer, but the Frenchman will only have 12 months left on his contract at the end of this season.