Paul Pogba informed Manchester United’s hierarchy that he wanted to leave Old Trafford more than seven weeks ago as the collapse in the midfielder’s relationship with manager Jose Mourinho was laid bare during an extraordinary training ground confrontation.

Pogba is determined to quit United for Barcelona, regardless of whether Mourinho remains as manager, and the deepening problems between the pair were played out in front of the television cameras at the club’s Carrington training ground on Wednesday morning.

Mourinho rounded on Pogba after apparently being enraged by an Instagram video of the Frenchman and Andreas Pereira laughing at team-mate Luke Shaw as they watched United’s dismal Carabao Cup penalty shoot-out defeat to Derby County on Tuesday night.

The United manager stopped Pogba in his tracks as he ran on to the training pitch by reputedly asking the player if he was “happy” they lost before dragging over a club press officer and demanding to know when exactly Pogba posted the clip as a tense, prolonged showdown ensued. Mourinho was also said to have been heard shouting “Paul, get out” but United denied claims the manager had told the player to leave training.

Pogba’s Instagram post is thought to have been published shortly after the shoot-out defeat, with poor wi-fi reception at Old Trafford supposedly blamed for the video going out then rather than in the first half when United were leading 1-0. Mourinho is said to have instructed press officer John Allen to apologise to Pogba after being informed of the timing of the post.