Arsene Wenger fears the worst with the imminent release of Sir Alex Ferguson's autobiography, reports the Express.
The Arsenal manager was the bitter rival of Ferguson for a number of years, before their relationship mellowed as Arsenal stopped competing regularly in the Premier League.
Tempers famously boiled over in 2004 when Manchester United ended Arsenal's unbeaten run - thanks in the main to a Wayne Rooney dive.
The heated battle boiled over into the tunnel and was later dubbed 'pizzagate', as the United legend was hit plush in the face with a slice of pizza following a buffet-throwing-melee.
For a number of years the pair were at loggerheads for the Premier League title, and Wenger jokingly commented that everyone should be afraid of the book release:
"We all fear the worst!
"I think it is good that he makes a book.
"Maybe he does not have enough time to think about his whole career. It is a bit short between the moment he stopped and the moment he brings his book out.
"But maybe there are some other books coming later, so it is an autobiography there could be two, three or four [versions] of it. I don't know."
And whilst Wenger's Arsenal have made an electric start to the season, United - managed by Ferguson's predecessor David Moyes - have struggled.
The Arsenal manager is hoping that the shadow of Old Trafford legend Ferguson doesn't hamper Moyes' time at the club:
"You do not want his personality to be a handicap for the club.
"You want him to be remembered as someone who has done extremely well for the club.
"It is rather to be a positive influence on Manchester United."
Wenger and his Arsenal side will take on Borussia Dortmund on Tuesday and will be looking to continue their fine start to the campaign.
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