The interview in particular the report points to is an interview with ESPN he did two weeks ago wherein Mourinho wonders why Pogba's performances in the World Cup for France were far more impressive than those with Manchester United.
As per the Italian journalist, Barcelona had offered defender Yerry Mina, midfielder Andre Gomes, and a sum of €50m for the services of the star midfielder.
Back in 2016, the 25-year-old completed his move back to Old Trafford for a-then world record fee, but things could have been very different according to one of Barcelona's directors.
Having won the World Cup this summer, Pogba is said to have become increasingly frustrated with Mourinho's attempts to play down the achievement.
That was a tempting swap deal but Manchester United made their intentions clear enough to reject the offer.
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Barcelona offer Mina, Gomes and £50m for Paul Pogba
He goes on to report that United do not want to sell the "important" player as they see him as the franchise of the club. In theory, Barcelona would have until the end of the month to sign Pogba before the transfer window closes in Spain.
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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.
However, the offer is much lower than you might expect for a player of the talent, age, valuation and profile of Paul Pogba.
The Sun claims he has told United he wants a £200k-a-week pay rise if he has to stay. They have been linked with a move for Grealish for some time, with The Sun now reporting chairman Daniel Levy has finally lodged a bid for the 22-year-old.
A number of United's under-23 squad could make temporary exits, with European leagues remaining open for business and English Football League clubs allowed to make loan signings until the end of the month.
The fractured nature of Pogba's relationship with Mourinho will give Barcelona hope that a deal can be struck.
The France World Cup victor has been linked with a move to the Nou Camp amid speculation over his future at Old Trafford.