However, the report states Pogba is not to the point where he wishes to force a transfer, with three years left on his contract at Manchester United.
Barca are said to have seen a bid involving towering defender Mina, midfielder Andre Gomes and around £45million rejected for a player that has had his ups and downs with manager Mourinho.
United are simply not interested in selling Pogba.
Paul Pogba may want to leave Manchester United but the midfielder will not get his wish this summer.
The France World Cup victor has been linked with a move to the Nou Camp amid speculation over his future at Old Trafford.
With less than a week to go in the English transfer window, it seems unlikely that United will sell Pogba, especially with Nemanja Matic out after surgery on his knee.
"Perhaps he needs to say "congratulations on winning your World Cup medal, but forget about that, because now it's about Manchester United".
The Daily Star say United are furious with Pogba's agent Mino Raiola for trying to engineer a move to Barcelona for the France star.
Pogba moved to Manchester United in the summer of 2016 for a then-record $121 million, and has been stuck with massive expectations ever since.
The 2018/19 season has started terribly for United and they haven't even kicked a ball yet.
The Mail reports that Pogba has sent United executive vice-chairman Ed Woodward a message to inform him of his decision.
Barring significant late moves, Mourinho will have to rely on a similar squad to the one that was unable to keep up with neighbours City last season.
Chelsea winger Willian, though supposedly happy at Chelsea, has revealed that he's targeting a reunion with former manager Jose Mourinho.