After Janssen and Brad Winchester tried to sandwich a Flyers player (resulting in a fight with Scott Hartnell), Janssen ended up having to leave the game in the 2nd period.
Reported a couple of minutes ago on the Twitter:
Janssen out two weeks with concussion and sternum contusion. - @jprutherford
Cam janssen will miss 2 weeks with concussion and sternum injury - @andystrickland
Video of the hit below. It was a vicious hit, and I wish Janssen the best. Guy was doing great last night, and I hope that he comes back and continues what is going to look like a great season.