From Macomb Daily reporter Chuck Pleiness ...
Defenseman Brad Stuart was back to work and will be in the lineup, Saturday, for Game 2. After being home in California for the birth of his second child, Stuart should bump Andreas Lilja out of the Detroit lineup tomorrow.
Today's practice was optional. Pavel Datsyuk and Tomas Holmstrom weren't on the ice. Datsyuk was reported as being ill.

To me, it's pretty clear that Datsyuk is banged up. But it hasn't shown in his performance. Hopefully, off-day rest will keep him at peak performance through the post-season.