"It's not a major injury," coach Michel Therrien said Monday. "We just don't want to take a risk."
Under rules enacted upon the recommendation of league general managers before this season, NHL teams are not required to disclose the nature of injuries.
Fleury was hurt during the third period of Pittsburgh's 5-2 victory over Buffalo on Saturday night but did not leave the game. He made 21 saves on 23 shots and is 8-3 with a 2.86 goals against average.
Fleury will be replaced by Dany Sabourin, who has a 3-1 record and a 1.68 goals-against average.
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