The Red Devils have made a stuttering start to the new season under the Portuguese coach and they slumped to their third defeat in the Premier League on Saturday when they were beaten by West Ham at the London Stadium.
Manchester United are currently in 10th place in the Premier League table and already nine points behind leaders Manchester City as they look to try and claw their way back into the title race.
The Red Devils were also dumped out of the League Cup in the third round last week after a penalty shootout loss to lower league side Derby County.
Manchester United will aim to get back to winning ways in the Premier League on Saturday evening when they host Newcastle United at Old Trafford.
And former Liverpool FC defender Carragher has now delivered a fascinating behind the scenes insight into what he thinks has gone wrong for Mourinho this season at Old Trafford.
Speaking to Sky Sports on Monday, Carragher said: “I’m not speaking out of turn here. I had a conversation with Mourinho after he left Chelsea.
“He was manager at the Soccer Aid game, a charity game. It wasn’t just me and him so I’m not betraying confidence. There were four or five people there.
“The big thing he said he learnt from the Chelsea exit was that you couldn’t single out a player in a meeting in front of the other players because the players do not accept this now.
“But it looks as if he has gone back to that or is still doing that at Manchester United.
“He’s stripped Pogba of the captaincy, which I agreed with, but it sounds like it was in front of the players.
“The players don’t want that now and that’s why he has lost the dressing room, and it’s not the first time.”
Manchester United were aiming to be contenders for the major trophies this season after they finished second and without any silverware last term.
MORE: Man United latest news
MORE: Arsenal latest news
MORE: Chelsea latest news
MORE: Liverpool latest news