United boss Mourinho was earlier seen breaking into a rare smile during the session, but all doesn't seem well with Pogba.
Cracks have been appearing in the Old Trafford squad in recent months, particularly between Pogba and Mourinho.
Things have got so bad, Rio Ferdinand even described the under-performing group as "warring".
Meanwhhile, the rest of the Red Devils appeared to have put this weekend's West Ham defeat behind them as they joked through a chilly training session at Carrington.
Mourinho even broke into a beaming grin at the Aon Training Centre, with Pogba seeming to reciprocate as he was put through his paces.
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This weekend, Pogba fuelled the fire of a rift between himself and the Special One further with an incredible post-match remark.
When Pogba, 25, was asked for his verdict on the defeat, he replied: "You want me dead?"
This weekend, club legend Ferdinand slammed "criminal" United players for their lack of effort in the defeat in East London.
After suggesting the squad were "warring", Rio added: "There are some big decisions to be made at United now. There will be conversations about the future of the manager."
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