Coach Jon Cooper didn't rule out a return at some point in the playoffs. The Lightning are tied with Florida for first place in the Atlantic Division.
"Naturally, if anybody gets hurt, especially someone like Anton, it's a stinger," Cooper said. "But I'm not going to sit here and say, 'One of our defensemen got hurt, that's it, we're mailing it in.' No way. Stral would be the first one to tell you, 'Boys, let's go extend the season so I can come back.' That will be our goal."
Cooper said Stralman was rattled by the injury.
"Hopefully, it can heal quick," Tampa Bay captain Steven Stamkos said. "It's a tough bounce for our group right now, especially heading down the stretch and into the playoffs."
The Associated Press contributed to this report.