If this war has to go to the very end, here are two reasons why Jose Mourinho will triumph Paul Pogba.
The French forward wants to leave Old Trafford.
Mourinho is also at odds with Eric Bailly, the Ivory Coast worldwide who is no longer first choice.
However, matters have escalated in recent weeks, with Pogba criticising the team's style of play, saying they should "attack, attack, attack", especially at home, and Mourinho taking umbrage at the player posting an Instagram video of himself in a jovial mood on the night of the Carabao Cup defeat against Derby County.More news: Trump gives news conference in New York City
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However, with Barcelona the apparent destination Pogba has in mind, it has been reported that the Spanish giants are in no position to afford the asking price United will understandably demand.
Luke Shaw has been another player who has a fragile relationship with Mourinho despite his return to first team action.
Pogba told his new club's official website: "I chose Tours, because in the different interviews I had with all the interested clubs, only the leaders of Tours understood me and convinced me to join their project".
Mourinho is one such manager who does not care about how valuable a player could be for the club's fortunes, if his attitude is not where it is supposed to be, Jose will get him out of the club.
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.
Lukaku does not want to be seen to be backing Pogba against Mourinho.