Montreal Canadiens head coach Dominique Ducharme confirmed Saturday that defenceman Sami Niku suffered a concussion in Friday's preseason game against the Ottawa Senators and will be out indefinitely. 

Niku, 24, was hit from behind by Senators forward Josh Norris in the first period of Friday's 7-2 loss. He left the ice and didn't return to the game. Norris was not penalized on the play. 

A seventh-round pick (198th overall) by the Winnipeg Jets at the 2015 NHL Draft, Niku signed a one-year, $750,000 contract with the Habs on Sept. 14 after being bought out by the Jets. 

The Haapavesi, Finland native has two goals and 10 points in 54 career NHL games.