Police have received a new report about a man wearing a mask and an orange wig driving near a Victorian school.

Williamstown North Primary School principal Jim Cahill said a staff member saw a man fitting this description driving near its school about 3pm on Tuesday.

"He was spotted by a staff member who thought it was unusual at the time, but possibly thought there were balloons in the car and it might have been a gorillagram," he said.

Mr Cahill said the staff member reported it to police after she saw a news item that night about two men also wearing a mask and orange wig driving past a primary school in Beaconsfield.

An alert for parents and students to be vigilant went out after the school was notified, he said.