In a photo, the France international playfully stared sideways into the camera, while in the accompanying text he invited his followers to "caption this!" and included the hashtag #heretocreate - the slogan to a marketing campaign by his sponsors, adidas.
Ex-Liverpool player Tamie Carragher support Neville's stance and tweeted: "Spot on! Plenty of clubs in Europe doing fine without him!!"
Former United defender Patrice Evra was unhappy that Pogba's fractured relationship with Mourinho continued to grab headlines, even after the latter was sacked.
United announced the decision to move on from Mourinho after the club's worst start to a season in 28 years was confirmed with defeat at Liverpool on Sunday.
Pogba was an unused substitute at Anfield as United were convincingly outplayed.
Mourinho has clashed with Pogba this season, announcing in September the 25-year-old had been stripped of the vice-captaincy.
The pair were filmed having an animated disagreement on the training ground later that month.
Skysports