A team spokesman declined to elaborate on the nature of Heatley's injury.
The Sharks recalled Dwight Helminen from Worcester of the American Hockey League.
Heatley assisted on the tying goal with 31.3 seconds remaining in regulation in Game 2 on Friday night in San Jose. The Sharks won 6-5 in overtime to even the series 1-1.
During the season, Heatley led the league with nine game-winning goals.
Information from The Associated Press contributed to this story.