Simmonds has 20 goals and 37 points in 59 games this season for Philadelphia, which hosted Montreal on Tuesday night. He was involved in a first-period tussle in Sunday's game and landed a fight-ending left hand to the side of Tony DeAngelo's helmet.
Simmonds joins a growing list of injured Flyers. Starting goalie Brian Elliott had surgery Feb. 13 for a core muscle injury and is expected to miss up to five more weeks. Backup Michal Neuvirth will be sidelined four to six weeks after suffering a lower-body injury in Sunday's game.