New allegations have emerged of how the HSE has awarded some contracts to former staff, without a tendering process.
The claims are made in a comprehensive dossier sent to the Dáil's Public Accounts Committee in recent weeks.
A summary of the dossier has been given to PAC members ahead of their meeting this morning.
The claims are understood to mostly centre around cases where contracts were awarded to companies led by former HSE staff, or where ex-HSE workers are now on the payroll.
They include cases where the HSE has paid former staff members for spaces in care homes, without first investigating whether better deals could be found elsewhere.
Committee chairman John McGuinness says some former HSE staff members have made huge money from unadvertised contracts.
Waterford TD John Deasy says he's particularly concerned about the allegations on nursing homes, especially given the recent scandals of abusive behaviour in those facilities:
The HSE was due to be called before the committee next month to discuss other issues, but that hearing may now be brought forward to allow the claims be investigated.
Our political correspondent Gavan Reilly filed this report for Today FM's National Lunchtime News:
