In an interview with ESPN FC two weeks ago, Mourinho questioned why Pogba's performances in Russian Federation were so much better than his displays for United last season.
Mino Raiola has been in detailed discussions with the Spanish club over signing the midfielder, two years after he rejoined United from Juventus for £89million.
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Pogba made 37 appearances in all competitions for Manchester United last season.
Other key factors in this operation which could work in Barca's favor are the apparently strained relationship between Pogba and United boss Jose Mourinho, and the French midfielder's fervent desire to play with Lionel Messi, something which he has reiterated on a number of occasions.
Pogba has yet to return to pre-season after his World Cup exploits in Russian Federation, despite the fact United kick off their Premier League season on Friday.
Raiola is known to have approached United about a raise for Pogba after Sanchez moved to Old Trafford from Arsenal in January.
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"I think the World Cup is the flawless habitat for a player like him to give [their] best", Mourinho said.
"We respect the player and the teams they are on".
"There are a lot of names that always get circulated around in the rumour mill - all of them are good players and we respect them themselves but we also respect the clubs they are now at". Where he's with his team on the training camp, completely isolated from the external world, where they focus just on football, where the dimensions of the game can only motivate.
But it seems United have turned down the shockingly-low bid.
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FC Barcelona could feasibly complete a deal to sign Pogba any time between now and the end of August, when the European transfer window closes.