"We don't even know what the injury is. We don't even know where it is, to be honest with you," Stars coach Ken Hitchcock said. "The general soreness just comes up all the time, and we've got to figure it out."
Injuries have plagued Hanzal this season. He missed training camp and all but one preseason game due to an ankle injury. During the regular season, he's missed three games with a lower-body injury and two games with a hand injury.
"It's very disappointing for him. We've learned to deal with it, but it's been very disappointing for him," Hitchcock said. "He's been a very effective player in every game, but for whatever reason he can't seem to stay healthy.
"It's been a big swing for us, because when you have a player that plays both ends of special teams and 5-on-5, there's a lot of ice time that gets allocated to that player. So, you've got to get other players up to speed. That's the challenge facing us."
With Hanzal out, Hitchcock will juggle his lines, including reuniting Jamie Benn, Tyler Seguin and Alexander Radulov on the top line. Those three have been split up the past nine games with Benn and Seguin centering separate lines.