Karlsson is with Abbotsford on an injury rehabilitation assignment from Calgary.
Along with Omark, Tristan Grant returned to Oklahoma City's lineup after missing 14 games with injury. But the Barons might have lost defenseman Alex Plante, who was helped to the dressing room after a third-period fight against Pierre-Luc Letourneau-Leblond. Plante was knocked to the ice and might have hit his head; he recently returned to play after recovering from a concussion he suffered while playing for the Edmonton Oilers.
Plante's status was not known by press time.