Kostin (upper body) has been activated off injured reserve, per the NHL media site.
With his activation, Kostin appears set to get back in the lineup against the Oilers on Wednesday. In three games while on a conditioning assignment with AHL Springfield, the 22-year-old center notched a pair of helpers, two PIM and a plus-2 rating. Despite his return to action, the Russian shouldn't be expected to offer more than low-end fantasy value given his limited minutes (9:30 per game).