SWANSEA NHS Trust has been accused of taking decisions about a multi-million-pound new super-hospital for Swansea "behind closed doors".
South West Wales AM Peter Black says he is concerned members of the public in Swansea are not getting a say over any transfer of services.
The trust is considering proposals for a new single site hospital to serve Swansea, which is likely to see the end of Singleton Hospital.
The M4-side former Felindre steelworks has been put forward as a possible home for a new hospital, though approval has recently been given for a hi-tech business park there.
Swansea University Vice- Chancellor Richard B Davies has called for a feasibility study into a single-site hospital at the SA1 development, close to the campus's school of medicine and research.
Another possibility is to centre major facilities at Morriston Hospital which could be rebuilt as a super-hospital.
Mr Black said yesterday, "My problem is that all the discussion on the options is taking place behind closed doors, and there is no attempt to engage with stakeholders or the public.
"The trust is already putting in place proposals to transfer some services from Singleton to Morriston without any public consultation.
"We need to have a public debate on the way forward now before we are presented with a fait accompli that cannot be undone."
Last month minutes of a Swansea NHS Trust meeting came to light in which planning difficulties with the Felindre site were acknowledged and a merger of Swansea's Singleton and Morriston hospitals at the latter site was mooted as the most likely way forward.
Swansea NHS Trust Associate Director of Corporate Services, Steve Combe, said yesterday, "We would like to reassure Mr Black that far from decisions being made 'behind closed doors' the reality is that there is already a wide range of close working underway with partners."
He added, "The situation is that the Assembly will shortly be given a report about why the current system is unsustainable, and a request will be made to include Swansea in the all-Wales capital budget.
"If that is given approval, an outline business case then has to be developed, which will go into more detail about what the options would be.
"We will seek to have public involvement in that process, and will be launching a formal public consultation."