View Photo Gallery: The Flyers top Tarik El-Bashir’s weekly NHL power rankings, but they’ll be without Chris Pronger for the foreseeable future.

Apparently Sidney Crosby is not the only big-name NHL still dealing with a lingering head injury.

On Friday the Philadelphia Flyers announced veteran defenseman Chris Pronger will be out indefinitely as he deals with concussion-like symptoms, confirming what many suspected when the former Hart Trophy winner missed four games with an unnamed “virus”.

Pronger underwent left knee surgery late last month and has not played since Nov. 19 in Winnipeg.

“While Chris’ knee is improving, he has struggled with other issues that are concussion-like symptoms,” Flyers general manager Paul Holmgren said in a team statement. “Chris will see Dr. Joe Maroon and Dr. Mickey Collins on Wednesday, December 14th in Pittsburgh for further evaluation. Chris will be out indefinitely.”

Pronger missed six games after taking a stick to the face from Mikhail Grabovski during an Oct. 24 game against Toronto. One of the league’s most physical defensemen, Prongor immediately dropped to the ice and could be heard screaming as he raced into the locker room for treatment.

It was a scary scene and one that led him to bolt a visor on his helmet for the first time in his career when he returned to action.

But the affects of the incident continue to linger, just as they have with Crosby — who is currently sitting out consecutive games for the Penguins as a precaution.

And while Holmgren and the Flyers stopped short of calling the injury a concussion, he said the 37-year-old Pronger was experiencing a “fairly persistent headache, just a sluggish feeling.”

Both Maroon and Collins were consulted during Crosby’s treatment. He ended up missing 320 days after sustaining two hits to the head last winter.

More from Washington Post Sports:

Early Lead: Crosby to miss two games for Penguins

The Good Ol’ Hockey Game: NHL needs to wise up about visors

Capitals defenseman Jeff Schultz dealing with reduced playing time