Ehrhoff skated just two shifts before leaving Tuesday's game against the Blues after crashing into the boards, Dave Molinari of the Pittsburgh Post-Gazette reports. The bad luck continues for Ehrhoff, who returned in mid-March from a long-term absence due to a concussion before an undisclosed issue quickly resurfaced and forced him out of the Pens' previous game over the weekend. That injury didn't prevent Ehrhoff from suiting up Tuesday, but he saw just 1:13 of ice time before a check from the Blues' Vladimir Tarasenko sent him to the locker room. Ehrhoff appeared to crash headfirst into the boards on the hit, which only creates more concern that he might be at risk of another concussion. The Penguins aren't providing specifics on his injury just yet, but more information should become available after the match concludes.