The forward was sanctioned for his hit on the Devils' Dainius Zubrus during Sunday's Game 4, which Philadelphia lost 4-2 to go down 3-games-to-1 in the best-of-seven series.
Game 5 is set for Tuesday in Philadelphia.
Giroux, after arguing about a non-call on Devils goaltender Martin Brodeur for illegally playing the puck late the second period, struck Zubrus in the head with his shoulder.
Giroux has played a pivotal role in the Flyers' playoff run, racking up eight goals and nine assists over 10 post-season games.
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