A member of the Sláintecare Implementation Advisory Council says the contrast between their view of things and that of the Health Minister 'couldn't be starker.'
Liam Doran was speaking amid plans to disband the advisory group from the end of the month.
A new group, which will advise the Department of Health on regional health areas, is expected to become operational next month.
But Mr Doran told Newstalk Breakfast the council want to have one final meeting with the Government.
"I'm disappointed, but I'm not necessarily surprised in the light of what's transpired in the last two or three weeks with resignations, and I suppose the council being critical of the pace of progress on fundamental issues.
"Since we've had resignations of the chairperson and the executive director, we have met with the minister, we have met with senior health service management, we have looked again at the status of the plan and the fundamentals within the plan.
"I think the council was of a mind, or is of a mind, that we have one further step to take.
"And that may well be seeking a meeting with the three leaders in Government to indicate to them what we collectively feel is the current state of play."
He says the chairperson felt implementation of Sláintecare was 'impossible'.
"The contrast between the chairperson and executive director's view of things - in terms of the lack of implementation - and that of the minister and senior management couldn't be starker.
"The chairperson felt that implementation was impossible because of governance and accountability and commitment issues; and the minister and senior management feel that everything is moving along.
"So that's a a very stark contrast, and the council feels that we may have one further step to take which is just to let our collective view be known to the political system because there are obvious gaps in the implementation.
"I think we'll look for a meeting".
Mr Doran says a number of aspects - such as a Cabinet sub-committee on Sláintecare and a direct liaison reporting to the Taoiseach - "are not there at the moment, and they were never there".
Asked if he believes Sláintecare can be implemented, he says he fears for the plan.
"At the moment I'm very, very concerned that the Sláintecare report - as it was published - will happen.
"I fear that it's going to be chipped away at and be amended, and be picked and chosen and so on.
"Sláintecare is the biggest social change in our infrastructure if you like in terms of healthcare, it's a massive undertaking.
"And I'm not sure at the moment we have a full political and bureaucratic understanding that we're up for this journey, it takes 10 years, let's get on with it.
"The roadmap is quite clear, we simply have to follow it".