Arsene Wenger may have been half-joking, but you can be sure he is more than a little concerned about the unnecessary distraction.
Sir Alex Ferguson's book will be released on Friday, and Wayne Rooney is not to be the only one looking over his shoulder.
Wenger said ahead of this week's Arsenal game, "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."
The pair may now be on good terms, but it was not always like that. There could well be a few things for Wenger to be worried about. Here are three...
The battle of Old Trafford
Sir Alex Ferguson was already frustrated with Wenger, stating after the Gunners won the league in 2002 at Old Trafford: "He never comes for a drink with the opposing manager after matches. He's the only manager in the Premiership not to do so. It is a tradition here. It would be good for him to accept the tradition."
The infamous 'battle of Old Trafford' in 2003 did not help. The match ended 0-0 after Ruud van Nistelrooy missed a controverial late penalty. Taunting celebrations from Martin Keown sparked a mass brawl. Ferguson was not amused:
"Their behaviour was the worst thing I have seen in this sport. They got off scot-free.”
Revisiting the words said between the two bosses behind the scenes after the unsavoury encounter will probably be a drama Arsene Wenger could do without reliving right now with his team riding high.
The lowest point of the Ferguson-Wenger relationship without a doubt, back in late 2004. Sparked by a dressing room bust-up, after United ended Arsenal's 49 league game unbeaten record, a player - alleged to be Cesc Fabregas - threw a slice of pizza at Sir Alex.
The Scotsman even claimed Wenger fronted up to him afterwards as if to offer a fight. This is what he told the Mirror in 2005:
"To not apologise for the behaviour of the players to another manager is unthinkable. It is a disgrace.
"He was publicly criticising my players, calling them cheats. 'I went out and said to him: 'You get in there and behave yourself, leave my players alone'.
''He came sprinting towards me with his hands raised saying: 'What do you want to do about it?' He was standing right there.''
This will surely have more than just a small mention in Fergie's book, and more details of the clash with Wenger could come out.
The Robin van Persie phone call
Of the three, this could be the most embarrassing to the Arsenal manager.
Sir Alex Ferguson revealed he convinced Wenger to sell him Van Persie last summer after a phone call, the details of which have never been divulged.
Will Fergie re-tell it as though he took the Arsenal manager for a ride, laughing as he put the phone down?
The tale could could make the Frenchman seem as though stitched up like a kipper.
What are your memories of 'pizzagate', and the 'battle of Old Trafford'?
image: © marcel sigg