It's been called a headache by coach Mike Babcock, but perhaps it's more. Matt Ellis isn't on the ice for practice this morning and hasn't skated with the team since leaving Thursday's game in Nashville.
Tomas Kopecky (shoulder) is on the ice, but is taking part in just selected drills.

(Post-practice update: Neither Ellis nor Kopecky has been cleared yet to play Tuesday. When asked if Ellis has a concussion, Babcock answered, "I've never been told that. Obviously, he's not feeling as good as he should be. So we'll be cautious." Kopecky said that he has minor pain and feels ready to play.)

Today's lines ...
Datsyuk-Zetterberg-Holmstrom
Franzen-Filppula-Samuelsson
Cleary-Draper-Maltby
Drake-Hudler-Downey
Kopecky

Lidstrom-Rafalski
Kronwall-Lilja
Lebda-Chelios
Meech

Osgood (will start Tuesday)
Hasek