The squad looked glum as they arrived at Carrington after last night's dismal 0-0 draw with Valencia in the Champions League.
Mourinho's side are now without a win in their last four matches ahead of this weekend's clash against Newcastle.
And the struggling squad appeared to be without their manager this morning after tensions continued to rise last night.
Pogba, who has had several run-ins with the manager of late, refused to shake Mourinho's hand before kick-off.
And the French World Cup winner was spotted having an incredible on-field bust-up with Romelu Lukaku over the Belgian's lack of movement.
But both players, who have each scored four goals this season, returned to training this morning.
Mourinho has now banned Pogba from speaking out about the ongoing crisis at United following numerous bust-ups.
United's team clearly had nothing to smile about before training and Fred even tried his best to cover up his face with his hand.
And things only got worse for the Red Devils today after the Uefa charged them for arriving late to Old Trafford last night.
Mourinho blamed the police because they "refused" to escort the team bus through the busy traffic.
The ex-Chelsea chief claimed that the journey from the Lowry Hotel took them 70 minutes – when it usually takes half an hour.
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