The League Managers' Association have criticised Charlton for sacking Iain Dowie after just 12 games in charge.
Charlton appointed Dowie as Alan Curbishley's successor in May but a dreadful start to the season - the Addicks prop up the Premiership - prompted his dismissal last night.
LMA vice chairman Frank Clark said: 'We're always disappointed when one of our members loses their job and it's no different this time.
'Obviously we're very disappointed for Iain and it seems like a premature decision.
'We don't think 12 games is enough time at all for a manager to prove himself.
'But in today's Premier League world where everybody is looking for television money, it seems some directors think it is enough time.
'We'd like to think a manager should have a whole season to imprint his personality onto the club and make some improvements, but maybe that view is too naive in today's game.'
Clark insisted Dowie should have been given more time as Charlton's position is far from hopeless.
He said: 'Admittedly Charlton haven't made the best of starts but they are hardly cast adrift without any chance.
'There are eight clubs within a few places of each other and it would only take a couple of wins to totally change the picture.
'A month ago Steve Bruce was in the spotlight when Birmingham were in desperate trouble and now they are third in the Championship.'
Charlton gave Dowie £11.2million to buy players over the summer but Clark questioned their lack of patience in allowing Dowie to integrate the new signings.
He said: 'Charlton have appeared to back him by giving him the money in the summer, but why haven't they given him the time to bed those players in properly?
'When you bring new players in it takes a while for them to settle down. That's a fact of life.
'Having given him a lot of money to spend by their own standards, you would have thought Charlton would give him time to get it right.
'The new manager that comes in might not fancy the new players and off we go again, there will be more changes at the club.'
LMA chief executive John Barnwell feels the huge difference in income between clubs in the top flight and those outside it would have persuaded Charlton to act, particularly with the prospect of sharing in a new £1.7billion television deal for Premier League clubs starting next season.
Barnwell said: 'What has happened in the Premiership is that the insatiable desire to get immediate results has increased enormously.
'I suspect (the desire will be even greater) this year because of the increase in the proposed television money and the massive desire financially to stay in the Premiership. I think that is what it is all wrapped around.'
Barnwell told Sky Sports News that he believed Charlton were acting out of character.
'It doesn't sound like the longevity in any shape or form that Charlton have always been noted for,' he said.
'It's very very disappointing. If he was good enough 12 matches ago surely he is good enough now.'
Dowie is the first managerial casualty of this Premiership season, and Barnwell added: 'I hope this doesn't trigger things off.'