Members of the National Union of Journalists at RTE are to hold an emergency meeting today.
It's after undeclared payments - totalling €345,000 - were paid to Ryan Tubridy between 2017 and 2022.
An audit uncovered a deal with a commercial partner in exchange for a number of personal appearances a year.
The former Late Late Show host will not present his radio show this morning following the revelations.
Seamus Dooley from the National Union of Journalists says it's time for RTE to start answering questions.
"What we need at this stage is a comprehensive explanation from the Director General and the executive board of what happened.
"We have had a comprehensive statement from the board of RTE, the Chair has given a public interview.
"The RTE board did not sign off on the agreement, and therefore responsibility rests with the full time executive board.
"We need to know who made this decision, and why it was made."
