International Development Minister Christian Paradis will make an announcement from New York City at 10:15 a.m. ET. CBCNews.ca will carry it live.
Canada announced in August that it would provided $1.3 million to fight the current outbreak in West Africa, which has now killed almost 3,000 people.
Last week, Health Minister Rona Ambrose pledged $2.5 million worth of the specialized medical gear used to protect health-care workers.
But the 800-1,000 experimental vaccines promised in August still haven't been shipped to West Africa, Dr. Gregory Taylor, the country's new chief public health officer, said Wednesday.
The Ebola vaccine was developed at the National Microbiology Laboratory in Winnipeg.
But there are still questions about how and where to send it, Taylor said in an interview with CBC News, including how to keep it refrigerated for the entire trip to West Africa.
"The 800 to 1,000 doses that we offered to WHO is still in Winnipeg," Taylor said. "We're getting very close to shipping some of that."