The Irish Patients' Association says clarity is needed on the impact tomorrow's strike by 10-thousand health support workers will have on patients.
It says it's worrying there's been no explanation on what contingency plans are being put in place.
Both Letterkenny and Sligo University Hospitals will be affected by the strike with up to 700 staff collectively in both hospitals taking part in the industrial action.
Cleaners, chefs and porters are staging the 24-hour stoppage in a dispute over a job-evaluation scheme.
Spokesperson for the patients' association Stephen McMahon says the HSE need to be clear to patients on what they can expect: