The Rehab Group has written to its former chief executive, Angela Kerins and former board member, Frank Flannery, asking if they plan to attend the Public Accounts Committee next week.
This evening the group has given the PAC the names of the people who will be attending the committee meeting next Thursday.
The letter says that at the committee hearing, Rehab will be as forthcoming as possible, within the constraints they find themselves under.
A spokesperson for the Rehab Group said that its chairman has written to Angela Kerins and Frank Flannery on the issue.
Angela Kerins retires as CEO tomorrow.
Mr Flannery and Ms Kerins have not yet said whether they will attend.
PAC expects Kerins to appear before it next week
Earlier, Dáil Public Accounts Committee Chairman John McGuinness said the impending retirement of Ms Kerins does not affect the invitation to her to appear before the committee.
Mr McGuinness said he noted the retirement of Ms Kerins but this did not affect the matter the PAC are dealing with.
Sinn Féin's Mary Lou McDonald said she expected both Ms Kerins and the former Rehab CEO and Fine Gael strategist Frank Flannery to appear before the committee.
Mr McGuinness said the committee has had no contact from Rehab to confirm if they would be appearing before their scheduled appearance next Thursday.
He said he would expect Ms Kerins and Mr Flannery and those who had received notices to attend to appear before them.
Independent TD Shane Ross said Rehab was "playing cat and mouse" with the committee.
Mr Ross said it was important to get money back into charity boxes and Rehab was delaying this.
Ms Kerins' resignation followed controversy over the level of salaries paid in the disability support group and low profits from its charity lotteries.
Rehab confirmed in February that Ms Kerins was paid an annual salary of €240,000 with a 6% payment towards her Defined Contribution Pension.
She also has use of a company car, for which she pays Benefit in Kind.