His move to IR will free up a roster spot for the Flyers to bring up a defenseman because of injuries to Cam York (upper body), Emil Andrae (undisclosed) and Jamie Drysdale (upper body).
Ersson's timeline would see him miss at least the Flyers' next three contests, though it sounds like it could be longer. Given that recovery timeline, it wouldn't be a shock to see the team designate ...