Ferguson released his memoirs on Thursday, and discussed at length his decision not to sign Collymore in the mid-1990s from Nottingham Forest in the book.
"I have to say that was frustrating to read, especially as [the move] really did come very close to happening," Collymore told The Mirror.
"Fergie called my manager at the time, Frank Clark, and my agent Paul Stretford certainly made me aware he was interested. So, for him to come out with this comment now, is just him being wise after the event, in my opinion.
"I think that move could have been great for me, him and United. Certainly, I feel my life on and off the field may have taken a different path with Ferguson's guidance."