Hedman tried to deliver a hit to Washington’s Carl Hagelin on Saturday but took the worse of the confrontation when his chin bounced off Hagelin’s helmet.
Hedman, 28, is officially listed as day-to-day with an upper-body injury. Coach Jon Cooper told reporters that he didn’t expect Hedman back before the playoffs.
The Lightning have long since clinched the Presidents’ Trophy for the best regular-season record in the NHL, so they can afford to be cautious with Hedman. But missing the defenseman once the playoffs begin next week would be a big blow for Tampa Bay.
Hedman, the defending Norris Trophy winner as the league’s best defenseman, has 12 goals and 42 assists in 70 games this season.