About 1.4-million doses of the Pfizer-BioNTech vaccine are being delivered ahead of schedule this week.
However, the Public Health Agency of Canada says it is no longer confident it will receive another six-to-eight million doses of the Moderna vaccine next month.
Provincial leaders are counting on COVID-19 vaccine availability continuing to increase and more people getting a shot as economies prepare to gradually re-open.
Deputy chief public health officer, Doctor Howard Njoo says advice on whether provinces can mix and match vaccine types should be ready early next month.