Hudler, who leads the Flames with 30 assists and 43 points, sustained the injury 19 seconds into the third period after taking a hit from Senators forward Clarke MacArthur and sliding hard into the boards.
It is unclear when Wideman sustained his injury. He didn't come out for the third period after playing 12:08 through the first 40 minutes. His final shift ended with 33 seconds remaining in the second.
The Flames announced each player would not return.
After being through it and seeing the other [outdoor] games on TV, just the atmosphere is spectacular. To stand here -- and we are essentially almost on the blue line -- and look up [into the stands] and knowing it is going to be packed and playing our biggest rival in this setting is going to be pretty special.
— Bruins president Cam Neely on the 2016 Bridgestone NHL Winter Classic between Boston and Montreal at Gillette Stadium on
Jan. 1, 2016