Mason is officially ruled out with what the Flyers are calling an 'upper body injury' stemming from Saturday's game.
Backup Ray Emery will get the start in Game 1.
"I don't think our team feels like it's a blow. Listen there are injuries, things happen, you aren't always 100 percent, good teams find a way to get it done," said Craig Berube, head coach.
"I'm always excited to play especially playoffs, especially a team like this," said Emery
Emery will start a playoff game for the first time in three years.
While he's 7-2 lifetime against the Rangers, it didn't go so well the last time he faced them in New York back in January. Emery allowed four goals in a loss
"It wasn't the best game for the boys and myself, I'm not too worried about that," said Emery.
This is not how the Flyers want to start the playoffs but the players say their preparation and mindset will not change with Emery on the ice for at least Game 1.
"Ray has experience in the playoffs and he has won a cup so that good," said Claude Giroux
It's unknown how long the Flyers will have to count on Emery to save the season.
For now Mason is day-to-day. While the team travelled to New York, He will stay home for treatment.