More details are sure to surface on this one, but as of right now Penguins head coach Dan Bylsma addressed the media following Pittsburgh's 2-1 loss to the Habs Thursday night and mentioned Sidney Crosby will be out of the Penguins' lineup for one week with a concussion.

Source: Rob Rossi

Update: The cause of injury remains unclear but the hockey world is ripe with speculation.  Prior to the Penguins' game against the Lightning, any rumors of Crosby suffering concussion-like symptoms after colliding with Washington's Dave Steckel in the Winter Classic on New Year's Day were talked down.  Following Wednesday's Tampa Bay game, however, it was suggested that Crosby may have been injured after he was on the receiving end of a Victor Hedman boarding call late in the second period.

Crosby was ruled out of the Penguins' lineup heading into Thursday's game against the Canadiens with what was labeled as an "upper-body injury."

Video of the hit from the Winter Classic after the jump:

Update 2: The Post-Gazette's Dave Molinari is saying Sid was "apparently injured" in the Tampa Bay game.