The Public Service Alliance of Canada says more than 400 workers at the OLG Slots at Woodbine are set to strike.
The union says it has requested a no board report from the minister of labour, who has set the legal strike-lockout date of July 14th.
The union says no talks have been scheduled prior to the deadline.
It says the current round of bargaining began late last October workers,who rejected a tentative agreement in February, voted overwhelmingly in May to support strike action.