Gateway Casinos and Entertainment locations in Ontario, including Casino Rama, will remain closed until at least Friday, April 21 as IT systems are restored, according to a news release.
A cyber attack closed the facilities Sunday afternoon.
As of April 19, it does not have any evidence that personal information has been affected, officials stated.
"We want to reiterate that we have notified the relevant privacy officials about the incident and are working hard at restoring our systems," said the release.
The company adds that it will continue to provide further updates to the public regarding the reopening.