Ferguson described Keane as an 'intimidating, ferocious individual' with a 'savage tongue' but the new Republic of Ireland assistant manager wasn't too happy with the attention he received in the book.
"The beauty of football is everyone has opinions and I've no problem with that," he said when questioned on Sir Alex's book.
"The issue I'll have with, with anybody who seems to talk about me or has issues with what I've said in the past and people tell lies about me, that's when I'll come out and defend myself.
"Well I'm not going to sit here and defend myself regarding Alex Ferguson. That's for another day."
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