The new restrictions are part of the effort to prevent more infectious COVID-19 variants from spreading.
For weeks, Prime Minister Justin Trudeau has been warning Canadians they could be stuck outside the country at any time, and has urged people to cancel any non-essential trips.
Among the measures likely to be announced is a requirement that anyone returning from abroad must quarantine for two weeks in a hotel, at their own expense.
Police Looking for Missing Teen
This isn't the first time Jada Balgobin was reported missing
NRP Tracking Down Bail Violators
Police have been looking since last month, after receiving community concern
Pets Not Allowed at Thorold Cemeteries
Mayor Terry Ugulini had to be the deciding vote for a split council
Councillors Not Impressed with Frivolous Complaints
They don't like taxpayers paying for complaint against Mike Strange
Standard Building to be Torn Down
St. Catharines fire chief says building next door is also in trouble
ID of Human Remains Confirmed
Police say a skull was found in November near Read Road and Lake Ontario
Woman Charged After Pedestrian Killed
It happened last month on Thorold Stone Road in Niagara Falls
Cause of St. Catharines Standard building fire "undetermined"
Damage too extensive for an investigation