Mike Phelan, former assistant manager at Manchester United to Sir Alex Ferguson, says he is unsurprised by his old boss's book's revelations on former United captain Roy Keane - and said the pair both have "moments".
Phelan became Ferguson's assistant in 2008, working with him all the way to his retirement at the end of last season, and often filling in for the Scot in interviews after Ferguson had refused to talk to the BBC.
Phelan, who also made 100 appearances for the Red Devils as a player, firstly told BBC Radio 5 live: "I think it was a knee jerk reaction to the article in the book which was probably a bit presumptuous.
"Roy has his moments, as does Sir Alex so I think there is a small little feud going on between the two of them".
The former United midfielder, who also played for Burnley, Norwich City and West Bromwich Albion as well as earning one England cap, went on to say that Ferguson's book was always likely to upset someone, hence his lack of surprise at the revelations.
He added: "Having been there for so long, and lived through it all, it doesn't surprise me at all, but it is a book and there has to be certain things in a book which do upset people.
"But I think you have to take it at face value. It's his recollections, his history at Man United and along the way after so long, you're going to upset some football players and some people in the media as well.
It's par for the course when a book comes out."
During his time as Ferguson's assistant, Phelan helped United to three Premier League titles and two League Cups, as well as two Champions League finals in three years - both of which were lost to Barcelona.
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