The team announced Girardi's status Wednesday before visiting the defending Stanley Cup champion Washington Capitals. Girardi has missed the past five games.
Coach Jon Cooper says the 34-year-old's absence means the Presidents' Trophy-winning Lightning will continue to rely on midseason acquisition Jan Rutta.
Tampa Bay also is without defenseman Anton Stralman, who has missed the past six games with a lower-body injury. Cooper says Stralman won't play on this three-game road trip at the Capitals, Carolina Hurricanes and St. Louis Blues but could play next week.
The Lightning have wrapped up first place in the NHL and home-ice advantage throughout the playoffs, and still have nine games left.