Penguins winger Jake Guentzel left in the third period of Pittsburgh's 5-2 victory against Ottawa immediately after scoring a goal and did not return.
There was no update on his status following the game as he was being evaluated by team doctors.
On the play, Guentzel finished off a tic-tac-toe play to score his 20th goal of the season and 200th point of his NHL career. Right after the puck crossed the goal line Guentzel was tripped up by Ottawa's Thomas Chabot.
"It was really scary," head coach Mike Sullivan said. "Those are always dangerous when you fall that distance from the boards."
Despite the circumstance, Sullivan did not believe there was ill intent on the part of Chabot.
"I watched it afterward and it appeared to me like it was incidental contact," Sullivan said.
Losing Guentzel would be a huge blow to Pittsburgh. He leads the team in goals (20) and points (43), and was chosen to represent the Penguins in the 2020 NHL All-Star Game in St. Louis.
And the Penguins are still without Sidney Crosby (core muscle, 22 games missed), Nick Bjugstad (core muscle, 20), Brian Dumoulin (ankle, 12) and Justin Schultz (lower-body, 5).
"I hope the injured guys are back soon and I hope (Guentzel) isn't out too long," center Evgeni Malkin said. "But everyone understands it's hockey. It's tough. Sometimes we have a couple injuries. But I need to play better next game if Jake does not play."