Hartnell, an All-Star last season, was injured by a shot taken by teammate Kimmo Timonen in Tuesday's game against New Jersey. Flyers general manager Paul Holmgren made the announcement before Thursday night's game against the New York Rangers.
Hartnell had one point in three games. He led the Flyers with 37 goals last season and had 67 points.
The Flyers are still without forward Danny Briere (broken left wrist). Holmgren says it's 50-50 Briere will be available for this weekend's games at Florida and Tampa Bay.
You forget how good [Nieuwendyk] was. You hear the points and stuff and you almost forget until they kind of walk you through his career, and that was really cool for me. I might have felt it a little more than some of the other guys because he was one of my favorites growing up, but that was very cool and I'm honored to have been a part of it. I had chills the entire ceremony.
— Calgary's Joe Colborne on the "Forever a Flame" ceremony for Joe Nieuwendyk