Laura Magahy and Tom Keane stood down from their roles on Wednesday,
11 members of the Sláintecare Implementation Advisory Council say they are concerned following the "shock" resignation of 2 senior officials from the group.
Laura Magahy and Tom Keane stood down from their roles on Wednesday, saying that requirements for the plan were seriously lacking.
Sláintecare commits to end private practice in public hospitals and provide universal healthcare and free GP care.
The council says it is actively seeking answers from the Department of Health about the events that led to the 2 senior members standing down.

Sharp Rise In M9 Collisions With Garda Call-Outs Up Year-On-Year
Councillor Seeks Clarity On How Often Nightclubs and Late Bars In Naas Are Inspected For Fire Risks
New Figures From CSO Reveal How Much International Protection Applicants Earn Compared To Average Worker In Ireland
Unpaid Eight-Month Work And Training Placement For Adults With Disabilities Branded "Extremely Unfair"
Department Of Education Defends Kildare SNA Cuts Amid Claims Of Reduced Need At Some Schools
Naas Nurses Threaten Escalation As Staffing Row Deepens
Driving Tests Face Disruption As RSA Testers To Strike Next Week
Jury Delivers Not Guilty By Reason Of Insanity Verdict In Ballyfin Demesne Strangling Case