According to the Canadiens, Danault was taken to hospital but was awake and moving.
Danault was moving and speaking to medical staff before he left the ice, receiving an ovation from the Bell Centre crowd.
That was a relief for Chara, the big Bruins defenceman who owns one of the NHL's hardest shots.
"There's no doubt it's a special thing because I spent a lot of great years in (Boston) with an organization that treated me extremely well and I'm showing a lot of gratitude towards them for that", Julien said before the game Saturday.More news: Xbox One Outsold PS4 in December 2017
Canadiens coach Claude Julien confirmed after his team's 4-3 shootout loss that Danault would stay in hospital overnight, and be re-evaluated on Sunday. Sometimes we all get hit somewhere in the upper body. "I'm obviously wishing him a fast and full recovery".
Danault is stretchered off the ice.
Chara and other players from both teams gathered around Danault as he was attended by medical staff.
Chara stayed near Danault as he was down on the ice.More news: Premier League matchweek 23: Staff picks and predictions
"I wanted to make sure he was OK", said Chara. "So I was glad that he was doing OK".
The 24-year-old Victoriaville, Que., native, a first round draft pick by Chicago in 2011, is in his third full National Hockey League season.
Victor Mete, in his first game back after helping Canada win world junior championship gold, picked up an assist 3:22 into the game when the rebound of his point shot was tucked inside the post by Pacioretty.
Boston rookie Jake DeBrusk kicked off a wildly entertaining second period by beating Montreal goalie Carey Price on a breakaway to give his team its first lead at 2:55, only to see Montreal retake the edge on goals by Nicolas Deslauriers, at 5:45, and Alex Galchenyuk, at 8:51.More news: Haitian Church Holds Prayer Vigil In Aftermath Of Trump's Alleged Immigration Comments