Teacher 'hypnotised students' at Melbourne Catholic boys school

A high school teacher has been stood down as child sex detectives investigate allegations he hypnotised students at a Catholic boys college in Melbourne.

Mazenod College principal Christian Fini was made aware after school hours on November 23 of the teacher's "allegedly irregular behaviour".

He called the teacher in before classes began, stood him down and called police over the alleged hypnotising incident.

"These actions are outside the limit of the professional expertise which teachers are employed to perform at Mazenod and outside the legitimate activity of a school," Father Fini wrote in a letter to parents.

Catholic Education Melbourne executive director Stephen Elder said on Wednesday after the news broke that the college principal had acted promptly.

"Any unprofessional conduct by a staff member or inappropriate contact between a staff member and students was totally unacceptable," Mr Elder said.

Sexual Offences and Child Abuse Investigation detectives are investigating the report of the teacher hypnotising students at a school in Mulgrave, police say in a statement.