Forward Morgan Frost suffered a dislocated left shoulder in Tuesday's game against the Buffalo Sabres, General Manager Chuck Fletcher said in a statement.
Frost will be out indefinitely.
"We will provide further details about his return to play timeline in the near future," the team said.
SEE ALSO: Sean Couturier out two weeks
Defenseman Philippe Myers suffered a fractured rib in the same game. He is considered week-to-week.
Both were injured on checks by Jake McCabe and didn't return to the game.
The Flyers defeated the Sabres 3-0.