Valtteri Filppula left practice early Thursday to rest his ailing knee.
The Detroit forward suffered a sprained right in mid-November while playing in Finland during the lockout. "It's been bothering me for a little bit," said Filppula. "I was expecting to be still feeling it (because) it hasn't been that long (since the injury occurred). Hopefully it goes away soon." A troublesome knee could partially explain why he hasn't recorded a point yet after three games this season. He expects to play Friday against Minnesota though.