The Flyers will have to try to complete their comeback against the Bruins without goalie Brian Boucher.
Boucher is out for at least a month with a sprained MCL in his left knee that was suffered in Monday night's Game 5 win.
Boston opened up a 3-0 series lead, but Philadelphia has taken the last two games to stay alive.
Flyers Lose Boucher To Sprained MCL