Cammalleri, who is an unrestricted free agent, suffered the injury in the Flames' 2-1 loss to the Pittsburgh Penguins on Saturday night at the Scotiabank Saddledome. So far this season, Cammalleri has 13 goals and eight assists for 21 points, but is only a -20.
Cammalleri's name has been heavily involved in trade rumours this season because of his draft status.
The Flames are in Carolina this evening and in Nashville on Tuesday. Cammalleri did not travel with the team to Carolina, and is extremely doubtful with the Flames in the Music City tomorrow night either.
Cammalleri has already missed games this year because of a hand injury and the flu. Other Flames who are presently injured are Curtis Glencross, Blair Jones and Kris Russell. Glencross and Russell also were injured in a Flames' loss to Pittsburgh on December 21.