Matteau was injured in the first period of Saturday's game versus the Blues, and he couldn't put much weight on his right leg, Peter Baugh of The Athletic reports.
With Gabriel Landeskog suspended and Nathan MacKinnon in COVID-19 protocols, the Avalanche were already shorthanded up front entering Saturday. Matteau's injury leaves them with just 10 healthy forwards available due to salary cap rules. Head coach Jared Bednar could have an update on Matteau after the game.