The Rehab chairman says he "wouldn't dream of saying no" if called to appear before the Oireachtas spending watchdog.
Former chief executive Angela Kerins refused to appear at the Public Accounts Committee earlier this year amid controversy over the organisation's finances.
Chairman Sean Egan said he believes that if there are difficult question to be answered, they must be faced up to.
"I just would do it … there's no point in fighting with politicians, in my personal view. I want to work with them. It's like the media … [if] you want to get your messages out, you have to work with them."
"If things get a bit difficult, they get a bit difficult. You don't hide - you talk to them."
Rehab is currently recruiting her replacement, with a remuneration package worth €100,000 less than Ms Kerins had been earning.
The Rehab group unveiled a new board yesterday afternoon, replacing all but three of the previous members, and pledging to improve levels of transparency.