A Winnipeg hospital has fired a man who worked as a registered nurse for two years after it learned he didn't have proper credentials to be a nurse.

Cathy Rippin-Sisler, chief nursing officer at Seven Oaks Hospital, told CBC News that all the hospital's nurses have credentials checked on an annual basis.

In the latest check in December, it was discovered the man's documentation was not original.

"Immediately upon having these concerns or inconsistencies brought to our attention, this individual was removed from the workplace," Rippin-Sisler said.

The hospital contacted the College of Registered Nurses of Manitoba, and then officials' concern turned to patient care.

"We immediately began a review of all our records pertaining to things like critical incidents or occurrences to determine if the individual had been involved in any of them," she said.

"To date, we have not found any where the individual was involved."

Staff at Seven Oaks were surprised to learn about the situation, she said.

"I think there was a great deal of shock and concern that an individual would not have credentials that are consistent with our expectations," she said.

The hospital has since instituted a new human-resources process requiring all nurses to present their original credentials, which are then checked and added to a hospital database.