Following a well-documented bust-up with Jose Mourinho, Pogba has been heavily linked with leaving United this summer.
But Griezmann, Pogba’s France team-mate and close friend, says the 25-year-old is still happy in England.
And the Atletico Madrid ace has called upon the midfield powerhouse to now start to prove he is still capable of being one of the world’s top stars.
Griezmann said: “It’s not easy when you don’t play at your club or you don’t feel at your best. It happened to me and he knows that.
“It’s up to him to prove and show that he’s still the player that he can be”
Antonio Griezmann on Man Utd star Paul Pogba
“He still enjoys having fun and working hard, which are what matter the most. It’s up to him to prove and show that he’s still the player that he can be.”
Pogba and Griezmann are currently on international duty with France for their upcoming friendlies against Colombia and Russia.
The games will give Pogba a good chance to strut his stuff away from the scrutiny of life under Mourinho at United.
And Griezmann insists: “He came back with a huge smile on his face. He was happy.
“The coach [France boss Didier Deschamps] trusts him, like the entire squad. We need a smiling Paul and an efficient one on the pitch.”