Fergusonâ€™s new book hits this shelves on Tuesday and is set to cover the period from 1999 â€“ when his first autobiography was released - to the time he retired at the end of last season.
He told MUTV: "You know the problem with doing a book is you have to bring in the elements and factors which in many ways either affected or determined your decision-making.
"But because Iâ€™ve been at the club such a long time and youâ€™re building team after team after team, there are areas that you canâ€™t ignore.
"Like why we sold certain players like David Beckham and Ruud van Nistelrooy.
"You canâ€™t ignore these because these guys were big, big figures in Manchester Unitedâ€™s history."
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