KANATA, Ont. -- Ottawa Senators
forward Milan Michalek
, out since Dec. 13 with a concussion, participated in Thursday's morning skate while wearing a grey no-contact jersey and will not play in the game against the Florida Panthers
. He is expected to return after Christmas, the earliest being the Dec. 27 game against Montreal. Michalek will take a baseline test today to assess his progress, but wants to concentrate on his conditioning before returning.
re-aggravated his shoulder against Buffalo on Tuesday -- he practiced on Wednesday, but according to coach Paul MacLean
, it tightened up and he will be out of the lineup indefinitely. Ottawa will dress seven defensemen for Thursday's game to compensate. Regin previously had surgery on the same shoulder in March, but re-injured it in October and missed 22 games.
"He has to make the decision what's best for him," MacLean said. "Surgery (again) is an option."