Philadelphia Flyers defenceman Chris Pronger is out indefinitely with concussion-like symptoms.
Pronger will see doctors in Pittsburgh on Wednesday for further evaluation.
Pronger has been out since late November with a knee injury but Flyers general manager Paul Holmgren said the recuperation from that injury was going well.
In late October, Pronger took Mikhail Grabovski's stick to the eye that resulted in facial trauma that caused him to miss six games.
"We said it was a virus at first because we weren't sure what we were dealing with and just over this last two or three days where he's had a very persistent headache and a real sluggish feeling," Holmgren said.
"We didn't know what we were dealing with then and I'm not sure we do now but the concussion-like symptoms continue to persist and we're just going to get him checked."
This season, Pronger has one goal and 11 assists for 12 points in 13 games.
In other injury news, rookie forward Brayden Schenn will be out indefinitely with what doctors believe to be a mild concussion. He has missed the last two games due to an upper-body injury.