Ehrhoff admitted Sunday that it was a concussion that had sidelined him since March 24, NHL.com's Wes Crosby reports. Ehrhoff appeared to be trending toward a return from the head injury during the Penguins' first-round playoff series with the Rangers, but those plans were halted after he recently endured a setback in his recovery. The blueliner has said that he suffered multiple concussions during the season, so it sounds like he'll plan on taking it easy over the summer in an attempt to the start of next season. Ehrhoff will become an unrestricted free agent in July.