Sligo University Hospital has deferred all face-to-face appointments for the next two weeks.
The hospital is now holding virtual outpatient clinics with some exceptions.
The change comes as the hospital deals with more than 20 patients with Covid-19.
Patients who previously received a letter confirming an outpatient appointment are asked not to attend the appointment unless they get a call from the hospital confirming that the appointment is going ahead.
Patients who receive a confirmation phone call are asked to please attend the hospital at the appointed time.
Patients who develop any symptoms of COVID-19 prior to their appointment (cough, temperature, shortness of breath, loss or change to their sense of smell or taste) or who have been advised to self-isolate should not attend their appointment.
The Radiology Department at the hospital will contact all patients whose X-ray or scan is being postponed.
“The team at Sligo University Hospital would like to thank members of the public for their ongoing support,” a statement said.
Meanwhile, Letterkenny University Hospital is deferring all but very urgent and time-critical inpatient and day surgery from January 5th.
Outpatient clinics will also be restricted however some of these will take place virtually unless it is absolutely necessary for patients to be seen
The deferrals will be for a two week period initially and will be kept under review.
Patients will be notified directly if their appointment or procedure is being deferred.