Thompson's agent, Greg Lawrence, confirmed the news to ESPN's Adrian Wojnarowski, and this was later confirmed by the Warriors.
Adrian Wojnarowski @wojespn
Even if Warriors are able to keep Klay Thompson and Kevin Durant in free agency, it'll be a fight to reach playoffs in the Western Conference. Thompson's ACL rehab could take him into February or March -- and Durant likely misses entire season. Devastating turn of events. https://t.co/xKXayv9p34
Thompson went down on a third-quarter dunk attempt when he was fouled by Danny Green. He remained in the game to shoot two free throws before exiting.
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Thompson left the arena on crutches after the Warriors formally ruled him out for the remainder of the contest:
Head coach Steve Kerr later revealed Thompson told him he planned to return to the floor:
Thompson maintained his typical level of durability during the regular season, appearing in 78 games and averaging 21.5 points, 3.8 rebounds and 2.4 assists.
Thompson's injury came one game after the Warriors lost Kevin Durant to a ruptured Achilles tendon in his first appearance since suffering a calf injury versus the Houston Rockets in the second round.