The Frenchman is expected to force through a transfer after a controversial three seasons at from Old Trafford.
United had been hoping to recoup the £90m they paid Juventus for Pogba in 2016.
But Real Madrid, one of the leading suitors for the World Cup winner, are only willing to pay £50m for his signature, per the Daily Mail.
The reason for the reduction is due to Pogba entering the last year of his contract with the Red Devils.
United accept it would be best for Pogba to depart the club, but they will be kicking themselves that they didn't cash in last summer when bids of £150m were on the table.