The team said in a statement Saturday that the surgery to repair a lateral meniscus tear in Westbrook's right knee was successful and that a timetable for his return will be determined during the offseason.
Westbrook was hurt when rookie Patrick Beverley tried for a steal in the second quarter of Game 2 and ran into his knee.
Coach Scott Brooks says Reggie Jackson would start for Westbrook in Saturday's Game 3 of the best-of-seven series, which the Thunder lead 2-0.
It will be the first time Westbrook has missed a game in his career. He has appeared in an NBA-best 394 consecutive regular-season games and each of Oklahoma City's 45 playoff games.
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