Manchester United has made an $87 million offer to Juventus for Paul Pogba.

United let Pogba leave the club four years ago on a free transfer and he has since emerged as one of the world's best young midfielders.

Jose Mourinho gave United the green light to pursue Pogba, who also has received strong interest from Barcelona.

Alex Ferguson accused Pogba of "disrespecting Manchester United" with his actions.

Pogba feels he has achieved everything he can at Juventus and wants a new challenge.