Sam Allardyce has dismissed Fifa president Sepp Blatter's proposal for a managerial transfer window.
The Newcastle boss has warned that a system for managers similar to the one which governs the movement of players would bring meltdown to football.
"The transfer window is completely flawed, as far as I am concerned, and I have always said that right from the very start," he said.
"To have a managers' window would cause even bigger chaos."
Blatter - upset with the way Juande Ramos left Sevilla to join Tottenham and Ronald Koeman's swift departure from PSV Eindhoven to Valencia - suggests managers, like players, should only be able to switch clubs in January and during the summer.
The Fifa chief believes the move could curb the frequency of managerial departures and will discuss the matter at executive level.
"We will try to extend the rule that is valid for players to coaches," he said in the Daily Telegraph.
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Former Bolton manager Allardyce was unequivocal in his reaction.
"Absolutely not. There would be utter chaos in that particular window like there is utter chaos in the transfer window," he said.
"It creates inflation, it creates mayhem and it puts you in a hugely difficult position.
"People just need to show a bit more faith and a bit more patience in the managers they ultimately choose in the first place themselves and give them the time they need to do the job and not to knee-jerk react.
"They need to be brave and true to themselves."
Allardyce has been under increased pressure after Saturday's 4-1 home defeat to Portsmouth.
His stuttering side face local rivals Sunderland at the Stadium of Light on Saturday with the 53-year-old, who has taken charge of just 11 Premier League games for Newcastle, insisting success will take time.
"I haven't been sacked since 1995 at Blackpool and I don't want to be fired again," he said.
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