Letang hasn't resumed skating or exercising since sustaining a concussion in last Saturday's win over the Coyotes, Jenn Menendez of the Pittsburgh Post-Gazette reports. Letang, who has a history of head injuries, remains under evaluation and should probably be considered out indefinitely until he's cleared to start skating again. The oft-injured blueliner has been relatively healthy this season, missing only seven games, but it looks like his availability could be in jeopardy with the playoffs rapidly approaching.