Minister for Public Expenditure Brendan Howlin has said former Central Remedial Clinic CEO Brian Conlan should give evidence to the Public Accounts Committee tomorrow.

Mr Conlan resigned yesterday as CEO of clinic following the controversy over top-up payments at the organisation.

It was confirmed last night that he would not appear before the PAC when it discusses the top-up controversy this week.

Mr Howlin this morning said anyone who deals with public money should make themselves available to the PAC.

He said he has every confidence the committee will pursue the matter until it gets the full facts.

The minister also said it will be up to the committee to decide if it wishes to use powers to compel available through statute law.

Speaking on RTÉ's Prime Time last night, independent TD Shane Ross said he would ask the Public Accounts Committee to seek compulsory powers to bring in Mr Conlan.

Mr Conlan and another former CEO, Paul Kiely, had been asked to attend the meeting, along with current board members, to discuss the controversy over top-up payments to senior executives of the CRC.

A spokesperson for Mr Conlan said he had no information that is not known by the remaining officers and directors of CRC.