Mourinho was desperate to sign a top class central defender during the summer transfer window as the Man Utd boss continues to have doubts over the likes of Phil Jones, Chris Smalling, Eric Bailly and Victor Lindelof.
"I did not want just to get away from Bayern, but I was thrilled to try a new challenge".
The German defender has proven himself as a world-class player in the past few years and Mourinho was believed to be keen on bringing him to Old Trafford.
Pogba's agent Mino Raiola has also stirred up trouble by touting his client for sale to Europe's biggest clubs. "Not because I wanted to leave Bayern Munich by all means".
Boateng actually lined out against United in a pre-season friendly on August 5 and must have impressed Mourinho but the German global never looked keen on a return to Manchester.
And Boateng confirmed that the former Frankfurt coach was one of the factors keeping him. I feel well at Bayern.
"I had enquiries from PSG and Manchester United, "Boateng told Bild, per the Metro". He has recalled why his move to United failed and what he told Mourinho on the phone when informing him of his decision. "Everything has to fall in place to top this club, if I do it. [Bayern Munich boss] Niko Kovac gave me the feeling that I am very important for him and the club".
Boateng, 30, looked set for an exit from the Bundesliga champions in the previous transfer window with Paris Saint-Germain and Manchester United both lodging bids for the 2014 World Cup victor.
This summer's World Cup saw Pogba showcase exactly why Mourinho splashed out £89m to sign him from Juventus in 2016.