The head of the HSE will meet the Chairman of St Vincents Healthcare Group this morning over salary top-ups.
CEO Nicholas Jermyn was in receipt of a salary of more than €300,000 last year, which included €136,000 from private funds. The remainder was made up from public funds, plus a €20,000 car allowance.
The Public Accounts Committee says both the HSE and St Vincent's have more questions to answer over the scale of the payments.
Tony O'Brien of the HSE will meet Mr Jermyn and other representatives of the St Vincent's board today to discuss the top-ups.
Mr O'Brien is expected to ask them how they plan to become compliant with public sector pay rules.
"We need to understand how they arrived at where they're at, and look at the issues that arise [from] a public and a private hospital being managed jointly," he said.
The board of St Vincents has maintained that the salaries are all tax compliant, and are not funded by charitable donations.
They are likely to face even more questions about the top-ups later this month - when hospital officials are called to re-appear at the Public Accounts Committee.