Former board members at the Central Remedial Clinic are to be recalled for further questioning by the Public Accounts Committee.
Chairman of the committee Deputy John McGuinness wants answers to what he says are a number of questions surrounding governance and transparency, as well as the pension arrangements for former CEO Paul Kiely.
Mr Kiely was paid €742,000 from charity funds when he stepped down in 2012.
At the weekend, the former Chairman of the CRC, Hamilton Goulding said that the pay-off saved money in the long term.
Deirdre Garvey, head of Ireland's national charity network The Wheel, believes the controversy will have a knock-on effect on the whole charity sector.