The competition for the Maple Leafs' number one center position will come down to the disappointing Tyler Bozak and the newly-acquired James van Riemsdyk.
Pekka Rinne made 22 saves in Nashville's 5-0 romp over Colorado in Game 6 to knock out the Avalanche.
Sean Couturier played with a torn MCL in Games 5 and 6.
Sean Couturier had a hat trick and two assists in the Flyers' 8-5 loss to Pittsburgh in Game 6.
Jake Guentzel scored four goals and registered an assist to the Penguins to an 8-5 win over Philadelphia and clinch their first round series.
The Pittsburgh Penguins have confirmed that Evgeni Malkin (leg) will miss Game 6.
Mathew Barzal has been named as a finalist for the Calder Trophy.
Patric Hornqvist (upper body) is expected to return to the Penguins' lineup on Sunday.
Evgeni Malkin (leg) hasn't accompanied the Penguins for the pregame warmups ahead of Game 6.
Ivan Provorov (shoulder) will be in the lineup for Game 6 Sunday afternoon.
Evgeni Malkin will be a game-time decision Sunday after suffering a leg injury Friday.
Slava Voynov has completed his three year deal in the KHL and could attempt to return to the NHL next season.