The Public Accounts Committee say they still have not received confirmation of whether Angela Kerins and Frank Flannery will attend a hearing on Thursday.
Rehab announced earlier that it had appointed a consultant to oversee a 'root and branch' review of its structures.
This afternoon the Taoiseach repeated calls on Ms Kerins and Mr Flannery to attend Thursday's PAC hearing.
Enda Kenny told the Dáil that anyone involved in an agency that spent public money should be prepared to go before the committee.