The Frenchman was pictured adding his autograph to jerseys and taking photos with fans after landing in Turin, only to wag his finger at one offered a United shirt.
Pogba arrived in Juve as a returning hero, joining the Serie A giants for free for the second time after leaving United.
The midfielder left the Red Devils as an academy star in 2011, joining Juventus for nothing before heading back to Old Trafford in a then world-record £89million deal.
That ill-fated six-year stint came to an end this year with Pogba's final two games for the club seeing him booed against Norwich, before only lasting 10 minutes in a 4-0 loss against rivals Liverpool.
And the bad blood between the 29-year-old and his former club seems to have continued over to Italy where a crowd of Juve fans gathered to greet him upon landing.
One held out a red United top, only for Pogba to seemingly dismiss him with a wag of the finger.
Pogba becomes the second free arrival in Turin this summer, joining fellow former United player Angel Di Maria who arrived from Paris Saint-Germain.
Man United meanwhile are struggling to replace the midfielder.
They have, so far, only signed Tyrell Malacia, a left-back, although Christian Eriksen's arrival is believed to be imminent.
The Red Devils are also keen on signing Frenkie de Jong and Lisandro Martinez but movement has been slow in the transfer market.