Bruins defenseman Adam McQuaid was injured after he took a hit in the back by Washington's Zach Sill and was leveled face first into the the glass Tuesday night at TD Garden.
McQuaid was facing the boards when Sill drove McQuaid's forehead into the glass in the second period.
McQuaid left the ice with help from the Bruins training staff and did not return for the start of the third period.
Sill will have a hearing with the NHL's Department of Player Safety on Wednesday, the league announced.
After the game, Bruins coach Claude Julien said he did not know about McQuaid's condition. Sill was not penalized.
"I thought it was a bad hit," said the Bruins' Patrice Bergeron, who grabbed Sill after the incident. "It's one of those where it happens fast. From my angle, it was a bad hit. There was no need for him to hit him like that. It was definitely tough to see Adam go down as hard as he did."
Fluto Shinzawa of the Globe staff contributed to this report.