Cardiff have called for League Managers' Association chief executive Richard Bevan to resign after the Malky Mackay scandal descended into a day of apologies and accusations.
Mackay's former club called for Bevan to quit in the wake of what they called an "entirely reprehensible" LMA statement on Thursday night which described racist texts sent by Mackay as "friendly banter".
The Welsh club also strongly refuted the LMA's criticism of the timing of the release of the dossier regarding Mackay and former head of recruitment Iain Moody to the Football Association as "preposterous".
Cardiff say the LMA had known about the existence of the offensive messages involving Moody and Mackay for months and had therefore been "complicit in the attempt to conceal these messages". The club statement added that there were "many more" than the two messages from Mackay contained within their dossier.
Earlier on Friday, the LMA had apologised for some of the wording in the initial statement issued on Thursday night, saying it had been "inappropriate" and "has been perceived to trivialise matters of a racist, sexist or homophobic nature".
In a forceful response to the LMA's original statement, a statement issued on behalf of Cardiff by law firm Mishcon de Reya read: "We.. find it entirely reprehensible that the LMA should itself put out a statement which seeks to dismiss deeply offensive racist comments as 'friendly banter'.
"If that is the view held by the LMA, as appears from its statement, we consider that Richard Bevan's position is untenable and we call for his resignation."
Cardiff also took particular issue with an implication in the LMA's original statement that the club had timed the release of the text messages dossier to scupper Mackay's expected appointment as manager of Crystal Palace.
"That the LMA has sought to criticise the club for the timing of the report to the FA is preposterous, because the offensive communications have been in the knowledge and possession of the LMA for many months," Cardiff's statement added.
"When the messages came to light, over three months ago, the club strongly encouraged and advised Mr Moody and Mr Mackay to deal with the issue directly with the FA.
"It was made clear to them, and their LMA-appointed lawyers, that the nature of the communications meant the club was under a duty to report their findings to the FA if they did not take appropriate action themselves.
"Nevertheless, with the backing of the LMA, Mr Moody and Mr Mackay chose to do nothing. The LMA were therefore complicit in the attempt to conceal these messages (of which there were many more than the two isolated texts acknowledged by Mr Mackay)."
No one at the LMA was available for comment in the wake of the Cardiff statement, but the organisation had felt compelled to apologise for the statement it released on Mackay's behalf on Thursday evening.
" The LMA apologises for some of its wording, in its release yesterday, which was inappropriate and has been perceived to trivialise matters of a racist, sexist or homophobic nature. That was certainly not our intention," its statement said.
On the same day as a new report revealed reports of discrimination in the game had risen by 269 per cent in the 2013-14 season compared to the previous campaign, anti-discrimination campaign group Kick It Out said the damage had already been done.
The organisation's education and development manager Troy Townsend described the episode as "deflating" and added: "Incidents such as this make our job much more difficult."
QPR boss Harry Redknapp waded into the controversy by launching a bizarre defence of Mackay in which he said: ''He hasn't murdered anyone, he hasn't raped anyone and he is not a paedophile.''
Redknapp added: "I'm not condoning what he has done but show me someone who has never made a mistake and I will show you a liar."
Townsend was quick to dismiss Redknapp's comments, saying: "What (Redknapp) has said has no benefit at all. I don't know what is in Harry's head when he is saying that.
''What Harry has said shows a lack of understanding about the situation. These are really sensitive issues and you have to respect the reasons behind them. He's almost saying 'it ain't that bad is it?', but unfortunately for some people, it is.''