The male teacher was attacked ten days ago just as the bell had sounded for lunch. He was stabbed in the back by a masked assailant who then fled.
He was taken to hospital but his injuries were not life threatening.
Around 40 fellow teachers stopped work that day in a show of solidarity for their injured colleague.
The attack led to a reinforcement of security at the 1000-pupil school, with security guards posted at the gates.
Le Parisien newspaper reported on Friday that the 16-year-old is a pupil at the school. He has denied responsibility for the attack.