Paul Pogba is Jose Mourinho's fourth Manchester United signing and will be announced as the world's most expensive footballer.
United concluded a deal for Pogba while he holidayed in the United States and it is understood Pogba will officially be unveiled before the Premier League season starts.
Jose Mourinho wanted the £100million deal concluded by the end of this week and United have succeeded in doing so, having already agreed personal terms with Pogba's agent Mino Raiola almost a month ago.
Pogba, 23, decided to rejoin United a fortnight ago and his move was finalised exactly four years to the day since his Old Trafford departure was confirmed by Sir Alex Ferguson.
Mourinho vetoed a move for Miralem Pjanic earlier in the summer to prioritise signing Pogba. Pjanic moved to Juventus from Roma in a move which has worked to United's advantage.
Pogba was understood to prefer a move to Real Madrid but Raiola advised him on rejoining United . Zinedine Zidane lobbied Real president Florentino Perez to sign Pogba but the Champions League winners were reluctant to match United's fee.
United are understood to have agreed personal terms with Raiola in early July and reached a breakthrough in negotiations with Juventus over Raiola's commission last week.
United have already clinched the signings of Eric Bailly, Zlatan Ibrahimovic and Henrikh Mkhitaryan, and Mourinho confirmed M.E.N. Sport's story in May he wanted to strengthen four positions during his maiden press conference.
"We made a nucleus of four priorities, four positions, priorities," he explained. "To give a certain balance to the squad, to give a certain push in terms of quality, and the qualities that I need, that I want, as we know especially with the ones with more vision."
Mourinho outlined his desire to have his fourth signing in before next week's Premier League opener at Bournemouth.
"We are going to sign one more player that's for sure," Mourinho said ahead of Wayne Rooney's testimonial. "I don't want to speak about Paul because he's a Juventus player and I don't like other managers to speak about my players and I don't speak about their players.
"The reality is we’re going to sign one more player, the market closes, as you know, August 31.
"So, we have plenty of time to do that but I would like to do that before the Premier League starts."