Speaking to the United's official website ahead of the release of his new documentary - Sir Alex Ferguson: Never Give In, the Scot outlined his approach to transfers.
"I believe in instinct. I had a good instinct about players and I had a good instinct about watching players who I maybe wanted to buy.
"I knew that, looking at certain players, I could see traits that told me they were Manchester United players, or Aberdeen players, or St Mirren players. I could see that in certain players I watched. Instinct was really important."
Ferguson says he never became bored in the job.
"Listen, I could encapsulate it in this way. If I'm going to walk into the training ground at Carrington as the manager of Manchester United, and I look out on that football field and I see this fantastic training ground, why wouldn't I want to go in there every day? The only way you can do that is being successful.
"So, being bored? I was never bored in my life, about anything."
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