A Christchurch Catholic boys' school says it's committed to addressing concerns about historic sexual abuse by former staff appropriately

Rowan Maxwell Donoghue has admitted historic abuse at St Bede's College between 1996 and 2000.

The college first became aware of the offending nearly 20 years ago, and an investigation is underway to review how it was handled.

Rector Jon McDowall's confirmed the school also knew of allegations against a second priest.

He says the issues are distressing and the school's focused on responding with clarity, care, and integrity.