The Manchester Evening News says Raiola has had a transfer plan in the works for a while.
Two years ago, Pogba returned to United from Juventus.
It was a world-record £89million deal at the time and sent shockwaves around the footballing world.
Yet Raiola encouraged his return.
However, the super-agent told Pogba that, should he spend three years at Old Trafford, he would broker him a move to Spain.