Callahan left the ice cradling his left arm after he became tangled with the Flyers' Maxime Talbot in a post-whistle scrum. Both parties dropped their gloves, but Callahan grimaced in pain and never threw a punch before tumbling to the ice.
Earlier in the game, Callahan scored his second goal of the season, which turned out to be the game-winner as the Rangers edged the Flyers 2-1.
Rangers coach John Tortorella had no update on Callahan after the game and said he would be re-evaluated Wednesday.
For our team, as a group, we've never been this far before, and so it's just more lessons learned, and sometimes you have to go to the school of hard knocks to find out what works and what doesn't. We've got a young group. They've played some unreal hockey here to get us this far, and we showed if we're not going to play the proper way, a really, really good hockey team is going to beat you, and that's what they did. It's a lesson learned.
— Lightning coach Jon Cooper after Rangers win in Game 6 forced a Game 7 that will be played at Madison Square Garden on Friday