Chelsea bought Belgian hot prospect De Bruyne in January 2012 for £7m from Genk.
But he barely got a look-in under Mourinho at Stamford Bridge and pushed to join Wolfsburg in 2014.
It was a move that Mourinho was desperate to stop happening – but he was powerless to stop it going through.
“Jose Mourinho was a fan of Kevin De Bruyne’s talents and didn’t want to sell him at Chelsea”
Rob Beasley on former Chelsea boss Jose Mourinho
De Bruyne is now considered one of the hottest attacking talents in the country after making a £55m move to Manchester City last summer.
Rob Beasley has revealed all on the transfer saga in his fascinating new book Jose Mourinho: Up Close and Personal.
Beasley wrote: “Jose was a fan of De Bruyne’s talents if not his attitude and didn’t want to sell; it was the young Belgian who wanted to get away.
“The 22-year-old winger was unable to cope with his lack of game time even though it was his first season under Mourinho.”
De Bruyne spoke out earlier this year on his Stamford Bridge hell and life under the Special One.
He said: “Mourinho called in all the attacking midfielders.
“He showed us the stats of his six players – assists, goals, passing percentage, key passes, dribbles. He wanted to prove I didn’t perform on the level of the others.
“I simply answered him: ‘Sorry, that’s not logical. I’ve played less games than the others. How can you compare me to the others?’ That was just not fair in my eyes.
“There was talk that I didn’t train too much, stories I couldn’t defend myself against as the sessions were always behind closed doors.”