The Minister for Media has said that a four-week wait for a Grant Thornton report into non-disclosed payments at RTÉ between 2017 and 2019 "does not reflect the urgency of the situation", and has called for it to be accelerated.
The timeline was announced by the RTÉ Board this morning.
However in a statement this evening, Catherine Martin said evidence given by RTÉ executives before the Oireachtas Committee on Media today "revealed a shocking failure of governance at senior management level in RTÉ".
"This has not calmed the considerable disquiet about the lack of accountability at RTÉ in the public domain," she said.
She said her "focus remains on the external review of governance and culture at RTÉ", and added:
"Furthermore, the four-week timeline for the delivery of the second Grant Thornton report does not reflect the urgency of the situation and I have asked for that to be accelerated."
Meanwhile, RTÉ has said that a €120,000 end of contract payment contained in presenter Ryan Tubridy's 2015-2020 contract was not paid.
Mr Tubridy's actual earnings in 2017-2019 were understated by a separate €120,000 by RTÉ, in the published top ten earning presenters lists.
This understatement came to light during an internal review of Mr Tubridy's prior published earnings requested by the RTÉ Board last week, and is being examined in the Grant Thornton report.
Minister Martin said it was vital that the Executive Board of RTÉ "engages in as transparent a manner as possible" at tomorrow's meeting of the Public Accounts Committee.
A member of the Public Accounts Committee, Labour's Alan Kelly, said the answers today from the RTÉ Executive at the Oireachtas media committee were unacceptable and embarrassing.
Deputy Kelly said: "They would want to reflect on that before we meet as a PAC tomorrow. Unless they have a 'road to Damascus' conversion, I cannot see how the Oireachtas, or this Government, can have confidence in them continuing beyond that appearance."
Earlier, Taoiseach Leo Varadkar said it was "not satisfactory" that it will take four weeks before the Grant Thornton report into the non-disclosed payments between 2017 and 2019 will be published.
Speaking in the Dáil, Mr Varadkar said he does "not believe it's credible" that former Director General Dee Forbes is the only RTÉ Executive with knowledge of these events.
He said the revelations of non-disclosed payments at RTÉ are deeply unsettling and have shaken public trust.
He said the RTÉ statement yesterday had shed some light on the debacle, but a lot of questions remain.
He was replying to Sinn Féin's Spokesperson on Finance Pearse Doherty, who described the RTÉ statement yesterday as a release of "selective information" which "skirts around the issues at the heart of this fiasco".
Mr Doherty asked the Taoiseach that if RTÉ does not release the relevant documentation, would Ms Martin consider using her powers to send a "relevant person" into RTÉ to secure it.
He said that at a time when people were struggling, RTÉ executives had concocted a sweet-heart deal and then an elaborate plan to cover it up.
The Donegal TD contended that "RTÉ's top brass" knew about it, and the fact that it was "hidden from the public".
He said it was "not acceptable" that the Oireachtas would have to wait four weeks for the information about payments totalling €120,000 between 2017 and 2019.
Mr Varadkar said the minister "reserves her position" between appointing a relevant person or continuing with the announced external review into the clandestine payments.
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Mr Varadkar told the Dáil he could "see no reason" why RTÉ should not be able to put "any information in relation to" the payment of €120,000 to Mr Tubridy "in the public domain as soon as possible".
He said that there may be good reasons, but the matter should be put to RTÉ when they appear at the committees.
Social Democrats leader Holly Cairns said that it was not acceptable that to have to wait a month for the next Grant Thornton report.
She asked how RTÉ could claim ignorance as to how the extra payments to Mr Tubridy were made.
During Leaders' Questions, Labour leader Ivana Bacik called for an end to third-party presenter negotiations in RTÉ, and a cap on presenter pay.
Ms Bacik reiterated her party's solidarity with workers who took part in protests at the RTÉ Donnybrook campus and regional offices yesterday afternoon.
She repeated comments from chair of the NUJ Dublin Broadcasting Branch, Emma O Kelly, who described as "unbelievable" that somebody earning €440,000 would seek more money "in secret".
She also referred to comments from other senior journalists, who told yesterday's protest that freelancers in RTÉ are "paid a pittance by contrast, continually told we don't have money to support you, take it or leave it".
Ms Bacik said an external review of the organisation needed to focus on ensuring equity amongst workers.
Responding, Mr Varadkar said that the terms of reference were not finalised, adding that widening their scope can add to the length of time the review might take.
However, he added it was better to do it right, rather than quickly.
The Taoiseach also suggested that one of the recommendations from the Future of Media Commission, to compare RTÉ pay with that of other public services broadcasters who are members of the European Broadcasting Union, should be implemented.
Additional reporting Tommy Meskill
