Couturier sustained a lower-body injury in the first period of Game 3 on Thursday, but did not look restricted in the morning skate Sunday, took line rushes in pre-game warm-ups in his usual spot, between forwards Maxime Talbot and Eric Wellwood.
Couturier, the eighth pick of the 2011 Entry Draft, has three goals and an assist in nine playoff games, but has developed into the team's best defensive center.
"Sean is an important piece of the team," Flyers coach Peter Laviolette said following the team's skate Sunday morning. "He looked good skating out there. He's smiling, that's always good."
Here's how the lineup will look when the puck drops about 7:30 p.m. ET:
For our team, as a group, we've never been this far before, and so it's just more lessons learned, and sometimes you have to go to the school of hard knocks to find out what works and what doesn't. We've got a young group. They've played some unreal hockey here to get us this far, and we showed if we're not going to play the proper way, a really, really good hockey team is going to beat you, and that's what they did. It's a lesson learned.
— Lightning coach Jon Cooper after Rangers win in Game 6 forced a Game 7 that will be played at Madison Square Garden on Friday