A review of RTÉ finances is understood to have found a number of further barter accounts.
This is the type of account at the centre of the controversy over undisclosed payments to presenter Ryan Tubridy.
The latest information has sent shock waves through the political system, which is now braced for RTÉ resignations.
This revelation has been described as highly significant and there is a view that it signals a level of dysfunction and disarray beyond what emerged last week.
While Minister for Media Catherine Martin has not been fully briefed tonight, it is expected that she will be given the full details later.
There are indications that some of these latest revelations are linked to Toy Show the Musical.
A spokesperson for the RTÉ Board said it had no comment to make on the additional barter accounts, ahead of tomorrow's meeting of the Joint Oireachtas Media Committee.
The RTÉ Board met earlier this evening.
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A spokesperson for RTÉ said the broadcaster would provide comment and context regarding these barter accounts at tomorrow's committee meeting.
The organisation's Chief Financial Officer Richard Collins told an Oireachtas committee last week that there was only one barter account.
Barter accounts are a normal practice in a commercial media organisation, but, almost two weeks into this process, committees have consistently called for clarification. What could be considered problematic is that these details are only emerging at this late hour with a committee meeting tomorrow.
A spokesperson for Minister Catherine Martin said she is aware the Board of RTÉ met today and notes their comments.
She is awaiting an update from the chair. Any further developments of concern will be included in the forthcoming external examination of RTÉ initiated by Ms Martin.
Reacting to the revelations, chair of the media committee Niamh Smyth said it is "devastating for the entity of RTÉ and public confidence. The executive needs to come clean with the committee on all accounts".Fellow Fianna Fáil TD Christopher O'Sullivan said "the executive board members will have to be completely upfront and honest at tomorrow's session in relation to any knowledge of this or they will have to consider their positions".
He added: "My heart goes out to the RTÉ employees. Their moral must be at an all-time low."
Sinn Féin's media spokesperson and member of the Public Accounts Committee Imelda Munster said the revelations are "extremely concerning".
Read more: Explainer: What are barter account transactions?
She said: "The revelation tonight, with no further details, that more controversial barter accounts exist at RTÉ is extremely concerning. Unfortunately, it is not surprising.
"We now need full transparency. All of the details must be published without delay."
Labour's spokesperson on media Marie Sherlock said it is time for the broadcaster to "lay all its cards on the table".
She said: "There is now an existential threat to our national broadcaster and we cannot allow it to implode on itself.
"News breaking this evening that at least one more barter account is in use in the organisation is shocking for the public and gut wrenching for workers at RTÉ who have fought with management for additional crews and resources."
The first review will make recommendations to build stronger governance structures and to reform the organisational culture at RTÉ.
It will be overseen by Professor Niamh Brennan, Dr Margaret Cullen and a third person to be appointed in the coming days.
The second review will examine how external RTÉ contractors were paid and this work will be overseen by Brendan McGinty and Patricia King.
The minister said the external review into RTÉ is about rebuilding trust both with the public and staff and making sure Government gets answers that are needed.
These reviews are set to be completed in six months, but it will be some time yet before the work gets under way.
Coupled with these examinations, a forensic accountant will be appointed to RTÉ by August.
The minister is also mindful that two committees in Leinster House are probing these matters and Ms Martin is willing to widen the scope of these reviews if there are further revelations.
She told the Dáil this afternoon that work on the second Grant Thornton examination of payments to Mr Tubridy was ahead of schedule.
RTÉ bosses will appear again before the Oireachtas Media Committee tomorrow to answer further questions on the controversy.
