While some players have seemingly taken Pogba’s side - Anthony Martial and Eric Bailly are both allies of the World Cup winner - Lukaku has chosen to step back with the row between player and manager boiling over.
The Red Devils could only draw 0-0 with Valencia on Tuesday, meaning they are now winless in four games and are amid their worst start to a season for 29 years.
United have lost three of their first seven Premier League games and already find themselves nine points behind rivals Liverpool and Manchester City.
And while they have taken four points from their opening two Champions League matches, they have not made it easy for themselves to qualify from their group.
Paul Pogba fumed at Romelu Lukaku during Man Utd's draw with Valencia (Image: BT SPORT)
Paul Pogba was clearly livid with Manchester United team-mate Romelu Lukaku (Image: BT SPORT)
United legend Rio Ferdinand can understand Ferdinand’s frustrations and said: “Lukaku is so easy to mark at the minute, he’s static.”
“He needs to make defenders think, he needs to start moving in behind, making your defender change position and change eyeline.”
While Paul Scholes let rip at Mourinho after another limp display.
"I think it's a bad situation," said Scholes,.
"I'm slightly surprised that he survived because the performance was that bad.
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Paul Pogba was clearly livid with Manchester United team-mate Romelu Lukaku (Image: BT SPORT)
"The performance and attitude was just nowhere near.
"He's coming out in press conferences and constantly having a go at the players, having a go at the people above him because he's not got what he wanted.
"I think his mouth is out of control and he's embarrassing the club."
Mourinho dismissed Scholes' comments last night, claiming he was not interested after watching United extend their winless run to four games.
"I don't need to know what he said," replied the United boss. "He says what he wants to say.
"I'm not interested, freedom of speech, free country, you can say what you want."