The French midfielder shared a picture of himself looking smug with the line: "Caption this!", before deleting the post.
Pogba and Mourinho have had a notorious falling out this season which has ultimately been one of the crucial factors to his manager's downfall.
The pair had an infamous training ground bust-up in a video which went viral on social media.
The former Chelsea chief also made an astonishing attack on his record signing earlier this month – labelling Man Utd's record signing 'a virus' in front of his team-mates.
But the World Cup winner has come out on top as the Portuguese was shown the door by Old Trafford chiefs this morning.
Mourinho was sacked after guiding the Red Devils to their worst league start in 28 years.
And former Red Devil and pundit Gary Neville was furious about Pogba's tweet.
He wrote on Twitter: "“Caption This “ You do one as well !"
On Monday, Neville said Mourinho would be sacked soon and blasted the board for handing him a new contract in January.
Michael Carrick will now take the reigns at Manchester United but the club are set to look externally for a caretaker manager in the wake of Mourinho's departure.
Mourinho is set to receive an astonishing £24million after being sacked by Man Utd.
Next Man Utd manager odds
Zinedine Zidane – 10/11
Antonio Conte – 4/1
Mauricio Pochettino – 5/1
Laurent Blanc – 5/1
Arsene Wenger – 14/1
Leonardo Jardim 22/1
Mikel Arteta – 25/1
Ryan Giggs – 33/1
Eddie Howe – 33/1
Brendan Rodgers – 33/1
Diego Simeone – 33/1
Roberto Martinez – 33/1
Luis Enrique – 33/1
Didier Deschamps – 33/1
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