The incident occurred with 1:37 remaining in the second period when Chara fired a 76.5 mph shot from the blue line, per CBC (h/t ESPN.com).
According to the Associated Press, Danault "was moving and speaking to medical staff before he left the ice" at the Bell Centre in Montreal.
The Canadiens later released a statement and confirmed Danault was moving and awake when he was transported to the hospital with a head injury that will require additional testing.
However, Danault's tenure in the Windy City was cut short in 2016 when the Blackhawks shipped him to Montreal ahead of the trade deadline.
Through 42 games this season entering Saturday night, Danault had registered seven goals and 15 assists for 22 points. The only Canadiens players with more points to date are Brendan Gallagher, Alex Galchenyuk and Max Pacioretty.