Boston Bruins goaltender Tuukka Rask has been diagnosed with a concussion.
Rask was not on the ice for the optional morning skate Thursday one day after he had to be helped off the ice following a collision with rookie forward Anders Bjork at practice.
Backup Anton Khudobin will start for the Bruins against the Vancouver Canucks on Thursday (7 p.m. ET; SN360, NESN, NHL.TV) and Zane McIntyre was recalled from Providence of the American Hockey League to be his backup.
Bjork appeared to be knocked off balance before colliding with Rask in front of the net. Teammates came to Rask's assistance, and he was helped off the ice after a few minutes.
It will be the second start of the season for Khudobin, who made 29 saves in a 6-2 win at the Arizona Coyotes on Saturday.
"Sometimes with the injuries, you look around and go, 'What's next?' But I think that's a lousy approach to take," Bruins coach Bruce Cassidy said. "I think Anton's very excited to get a start tonight. ... One door closes, another one opens. That's the way you've got to look at it."
Rask, 30, is 1-3-0 with a 3.30 goals-against average and.882 save percentage in four games this season.