Selected by Philadelphia with the No. 8 pick in the 2011 NHL Draft, Couturier has scored 443 points (174 goals, 269 assists) in 692 regular-season games and 22 points (10 goals, 12 assists) in 39 Stanley Cup Playoff games.
"This guy's an elite hockey player," Flyers general manager Chuck Fletcher said Thursday. "I don't know, maybe I like him more than some other people, but he is extremely good offensively, is extremely good defensively, is great on face-offs, he's a play driver. ... When we're down a goal we play him, when we're up a goal we play him. He's a rare talent. You just can't find these players.
"Sean would have been very richly rewarded had he become [an unrestricted free agent] next summer and we're thrilled that he worked with us to give us a cap hit that we were able to get. To have a No. 1 centerman at $7.75 million is a real advantage for our club as we try to build around him, as we try to build a Stanley Cup winning team."
Couturier won the Selke Trophy, voted as the best defensive forward in the NHL, in 2019-20 when he led the League in face-off winning percentage (59.6 percent, minimum 750 attempts) and was second in defensive-zone face-off winning percentage (59.5 percent).
Fletcher said he thought it was important to settle with Couturier now rather than wait until after next season.
"Certainly if this contract extension was hanging over Sean's head and the organization's head, I think it would have been difficult, it could have become a distraction," Fletcher said. "I think we, in speaking with Sean a lot this summer, our goal was to find a fair deal and to get it done this summer so that we can all focus on what we want to focus on next season and that's winning hockey games."
Fletcher said Couturier's new contract has a full no-move clause, with a limited no-trade clause in the final season.
"Sean is a cornerstone of this team, and we are thrilled that he'll be in Orange and Black for years to come," Flyers governor Dave Scott said. "With his leadership, grit, and ability on both ends of the ice, Sean is essential to the future of this team, and we couldn't be happier to keep him in Philadelphia for the long term."
NHL.com deputy managing editor Adam Kimelman contributed to this report