Karlsson (arm) is unlikely to return to the Stanley Cup Finals after leaving Thursday's Game 5, Chris Johnston of The Athletic reports.
Head coach John Tortorella hinted that Karlsson would not return, though he didn't commit to it fully. That will force a significant shuffle in the lineup, as Karlsson had been occupying a second-line role. It's not yet clear who will step into the lineup for him in Sunday's must-win Game 6.