The winger was taken to hospital, where scans revealed the severity of the injury. TSN reported that Buchanan broke his tibia and will undergo surgery on Wednesday morning.
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THE BIGGER PICTURE
Buchanan had played a part in every game for Canada so far in their Copa America campaign, starting against Argentina and coming off the bench against Peru and Chile.
Suddenly, Jesse Marsch loses a player who can stretch the field and attack with speed - in the most awful of circumstances, too.
WHAT BUCHANAN'S TEAMMATE SAID
Canada's Alistair Johnston described Buchanan's injury as a "freak accident" to TSN.
"It's a really difficult one, all of our minds are focused on this next match," Johnston said. "The thing with sports is freak accidents can happen. It was a nothing play, just a weird collision. Unfortunately stuff like that can happen."
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WHAT NEXT FOR CANADA?
Canada can't afford to let Buchanan's injury derail what has been a positive tournament for them. They recovered from a 2-0 defeat to Argentina in their opening group game to seal their place in the quarter-finals by beating Peru and drawing with Chile.
Next up for Marsch's side is a meeting with Venezuela in Dallas on Friday.