"If you're not happy, you can not give your best", said Pogba.
Pogba only returned to training at the start of the week after helping France win the tournament but he was thrust into the starting line-up on Friday and given the captain's armband, with his penalty setting up United's 2-1 win over Leicester.
"If you're not happy, you can not give your best", Pogba said after the game when asked about what represents happiness for him. "That's all I say".
"There are things and there are things that I can not say otherwise I will get fined".
"When people trust you and have confidence then you are good in your own head, it's going to be easier".
France World Cup victor Pogba has been heavily linked with a move to Barcelona in recent days, with the player's refusal to deny the links with the Catalan giants via his various social media platforms fuelling rumours that he is open to leaving United in this transfer window.
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"I always love the club (United)".
"I had my plans for many months and I find myself with the market closed in a situation I did not think I would be in", Mourinho said.
In comments widely regarded as reflecting continuing problems with his relationship with the United boss, he wrote: "I'll always give my best for the fans and my team mates, no matter what's going on". I came in the academy, I grew up.
"I actually like the signings Jose Mourinho has made, they're more along the lines of the players I'd like to see at this football club".
Following the Leicester win, Mourinho again praised Pogba, calling him "a monster" for completing 80 minuted despite a short preseason, but there still appears to be resentment on Pogba's end as to how he is being treated by his manager.
"It's not having just the armband", Pogba said of his view on leadership.