Sir Alex Ferguson has revealed the secrets of his management style in a series of interviews with Harvard academics, setting out his approach to matches, team talks and disciplining "fragile" millionaires.
Ferguson spoke with Harvard professor Anita Elberse and a former student Tom Dye in a series of interviews in 2011.
He also travelled to Boston earlier in 2012 to talk to current students about his approach to man-management and share the secrets of leadership skills and communication.
Robin van Persie said there were "no hard feelings" after he completed a move from Arsenal to Premier League rivals Manchester United FC.
In his first press conference as a United player, he said: "From my side and Arsenal's side, there is no hard feelings. No one is angry with me and I'm not angry with them".