It has been confirmed that Angela Kerins will appear before the Public Accounts Committee next week.
The Chief Executive of REHAB will face questions about her salary and the group's lottery and other expenditure.
REHAB was forced to disclose earlier this week that Ms Kerins has an annual salary of €240,000, plus additional perks.
PAC Chairman John McGuinness said they will, however, be restricted in the questions they can ask.
"We're focusing on the €83m or so that they would receive each year. Provided we keep that as our focus, then that's fine," he said.
"Whether or not the remuneration committee should be asked in is another issue."