An allegation has been made against a parish priest regarding "child safeguarding" issues.
The accusation has been reported by the Diocese of Tuam to the gardai, the Health Service Executive and the National Board for Safeguarding Children.
In a statement, Archbishop of Tuam Michael Neary said the priest will not be continuing in his ministry while the investigation is taking place.
"It is important to say that what has been received is an allegation, which will require to be investigated," the Archbishop said.
"In accordance with Church safeguarding policy, Fr X will not be exercising ministry while the investigation is under way.
"Fr X is entitled to the constitutional and natural right of every person to the presumption of innocence."
The allegation dates back to the 1980s.
Archbishop Neary said the diocese continues to work with the authorities to promote child safety, describing it as of paramount importance.