The United manager is said to have told Pogba and the rest of the squad at Carrington on Tuesday - hours before the Carabao Cup tie against Derby - that the World Cup victor would not be handed the captain's armband again despite skippering the team on three occasions this season.
Pogba has scored two Premier League goals this season, both from the penalty spot, although he was denied from 12 yards by Joe Hart against Burnley.
Those reports will now intensify ahead of the January transfer window as Mourinho seems to have finally lost his patience with the enigmatic midfielder.
In his post-match interview after the Derby loss, Mourinho insisted there was no fall out between him and Pogba, though.
Cruz, Beto Square Off at SMU in First Debate
Cruz advocated for more armed police officers in schools. "I did not try to leave the scene of the accident", O'Rourke responded. But ensure that 242 years into this audacious experiment, that we are still a nation of laws, and not one of men".
"My words at half-time were similar to the words against Wolves where I told the players that the result was open and we needed to close it, but again we concede one goal".
"I think teams are scared when they see Manchester United attacking and attacking. When we play like this, it's easier for us". But these are unusual times at Old Trafford for Jose Mourinho.
"I'm not the manager, I can not, like, say that, but obviously we should show more options of playing".
It was largely attributed to Jose Mourinho's side being knocked out of the Champions League early last season.
Pogba, who hasn't lived up to expectations since his then world record 89-million pound (US$116 million) move from Juventus in 2016, had been angered by Mourinho's remarks in July that he had played much better at the World Cup because he was not surrounded by his entourage.
However, the game turned inside eight second-half minutes when on-loan Liverpool winger Harry Wilson equalised for Derby and United goalkeeper Sergio Romero was given his marching orders for handling outside the box.