We now know that Mourinho was upset with Pogba because he believed that the Frenchman had made an Instagram post during United's defeat to Derby.
Witness the tense exchange between Mourinho and Paul Pogba on the training pitch on Wednesday, the day after United's Carabao Cup exit at home against Championship side Derby County.
However, according to The Mirror, Barcelona are only prepared to pay in the region of £100m for the 25-year-old and will not make an approach until the summer.
Many are confused by the way Mourinho seemingly picks fights with certain players but then demands them to perform for him, while some of the Red Devils stars apparently feel they have not improved under the former Chelsea boss.
The manner in which Jose has treated Pogba and some of the other players has baffled the squad, and a part of it has been left questioning the gaffer's man-management skills.
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Mourinho is under huge pressure at Old Trafford because of United's latest results, and isn't willing to entertain the player's attitude any longer.
Mourinho is being eclipsed by his rivals, and with Manchester City and Liverpool storming ahead in the Premier League, it won't be much longer before United fans have had enough.
However, it seems as though the pair's relationship is beyond fix, with some of the players having sided with their teammate, rather than their manager, with ESPN reporter Mark Ogden saying that "only a handful of players are now fully behind their manager".
Will it be Pogba or Mourinho who is first to buckle? The same went for Sir Alex Ferguson.
Ashley Young, Nemanja Matic and, before he retired and joined the coaching staff, Michael Carrick are among those who have kept their distance from Pogba. "They saved it for behind closed doors, like it should be".
Lukaku does not want to be seen to be backing Pogba against Mourinho.