- Penguins defenseman John Ludvig did indeed sustain a concussion in last night’s loss against the Stars and remains out of the lineup indefinitely, head coach Mike Sullivan told the Tribune-Review’s Seth Rorabaugh Wednesday. Ludvig, 23, had played just 5:29 in his NHL debut when he attempted to land an open-ice hit on Stars forward Radek Faksa, whose helmet collided with Ludvig’s jaw and caused him to fall to the ice. Pittsburgh claimed the young defenseman off waivers from the Panthers at the beginning of the season.