Luongo stuck out his right pad to make a save, and immediately fell to the ice. He was helped off by Panthers' trainers, and was unable to apply any pressure on his leg.
Following the game, Florida head coach Bob Boughner didn't have any details on the injury, and said his veteran netminder will be further evaluated Tuesday.
The 38-year-old has a record of 6-6-1 this season to go with a .928 save percentage. He was placed on injured reserve in October with a hand problem, and was shut down late last season to undergo hip surgery.