The Public Accounts Committee has said it is not yet known if a Garda Whistleblower will give evidence in public or private.
The PAC is investigating claims that more than 200 senior Gardaí cancelled penalty points for public figures, family and friends.
The Garda Commissioner Martin Callinan appeared before the committee on Thursday and denied that high profile people are given special treatment over penalty points.
Two Garda whistleblowers have offered to appear before the PAC.
Committee Chairman John McGuinness says it is unclear at the moment if the first one will appear in public or private.
Mr McGuinness said: "That decision has to be made, whether it will be in public or private, and we've had to ask the whistleblower to take some legal advice in relation to his position giving evidence at the Public Accounts Committee.
"There are a number of decisions that have to be made by the members, first of all will it be in public or in private?
"Secondly, when the whistleblower responds to the committee in writing, what will be the content of his statement and can it be heard at PAC."