Ontario's English Catholic teachers say they will be starting an administrative work-to-rule campaign on Monday.
Their announcement comes the same day as high school teachers stage a one-day strike in select boards across the province, the latest in a series of rotating strikes.
The Ontario English Catholic Teachers' Association say they have bargaining dates with the province Thursday and Friday.
But if no deal is reached, OECTA's 45,000 members will start job action on Monday that includes not participating in standardized testing, preparing report cards or participating in Ministry of Education initiatives.
Education Minister Stephen Lecce is set to hold a news conference this morning.
In addition to their rotating strikes, high school teachers have also been on a work-to-rule campaign, as have elementary teachers, amid a contentious round of contract negotiations.