Pogba underwent tests with doctors in Los Angeles – after flying there from Florida where he was on holiday.
The Juventus star, 23, will earn a massive £275,000-a-week at Manchester United after agreeing a five-year deal.
He is poised to take the No.6 shirt, previously worn by Wes Brown and Jonny Evans.
United wiil pay a world-record sum of £112m to bring him back to Old Trafford – just four years after letting him go for £800,000.
The mega fee eclipses the £85m Real Madrid paid Tottenham for Gareth Bale in 2013.
**MANCHESTER UNITED TRANSFER NEWS: WHO DOES MOURINHO WANT? WHO HAS SIGNED? WHO COULD LEAVE?**