He also defended his reasons for publishing the book in which he criticised former players such as
adding that it was "astonishing" that he only had "six issues with players" during his time at Old Trafford.
"I wrote the book for the fans, to help them understand why I had to make certain decisions," he said at a sold-out Lowry Theatre in Salford.
"[It was] not for the press, that was a book to help people understand how difficult the job is at Manchester United. It's a massive job, it's the biggest in the world."
In 'Alex Ferguson: My Autobiography', which was released on Thursday, Ferguson stressed that many of his decisions were made in order to maintain control at the club.
And he re-emphasised that in front of a 1,700-strong audience, which included Moyes, fellow club director Sir Bobby Charlton and United legend Denis Law.
"In 27 years at the club, I probably only had six issues with players," he said. "That's astonishing.
"Of course you have to make decisions for the benefit of the club, and you become unpopular with the players as you have seen from the reaction this week.
"But that's part of my job to protect the standards of the club, the discipline of the club and make sure the players respect you as manager. I'm the manager and no-one else."
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