Late last month, sources told ESPN FC that United and Juventus had finally agreed to all the details of Pogba's world-record transfer.
United had already agreed to pay Juventus' £101.3m (€120m) asking price for Pogba but had been in negotiations over extra fees.
After protracted talks, it emerged that United will pay a £95 million (€112.6m) transfer fee for the 23-year-old plus £20m (€23.7m) in agents' fees.
The amount that the clubs would pay Pogba's agent, Mino Raiola, was a main sticking point in talks, as Juve had insisted that the Old Trafford club pay it all.
But the three parties struck a deal, with United negotiating to pay Raiola less than the initial figure and Juve set to pay the tax on the deal.
In an interview with ESPN Deportes, broadcast on July 13, Pogba had described United as "my first family."