Moments after the official announcement of the sack, Pogba shared a photo of himself on his verified Instagram page, looking mischievously at the camera.
He asked his followers to caption the photo. He also tagged the official Man United account and added hashtags.
Pogba has since deleted the post but not before it was screengrabbed. He alongside his former coach has been trending on social media.
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Man U announced on Tuesday the sack of Mourinho, with immediate effect via its verified Twitter handle.
Pogba hasn’t started a Premier League game since the 2-2 draw at Southampton on December 1.
He was also stripped of his vice-captaincy after a much-publicised training ground spat with Mourinho.