Representatives from FORSA, SIPTU and the PNA are meeting with staff currently working in the Rosalie Unit in Castlerea in the next hour.
They will be briefed on a document agreed between unions and the HSE at the Workplace Relations Commission in relation to the process by which their future roles will be discussed.
The HSE is currently moving residents from the community psychiatric facility with a view to reconfiguring the service.
It is seeking to pursue a range of options, one of which is a mental health hub including a day hospital for young people.
Councillor Paschal Fitzmaurice is hoping that the HSE will address the concerns staff have.