Golden State Warriors shooting guard Klay Thompson has been ruled out for Friday’s contest against the Boston Celtics, interim head coach Luke Walton said Friday.

Thompson did not practice Thursday after suffering a sprained right ankle at the end of Tuesday night’s 131–123 win against the Indiana Pacers, in which he scored a season-high 39 points. He had been considered day-to-day. Ian Clark will start in Thompson’s place, Walton said.

Walton said Thursday if there was any concern at all about Thompson’s injury, he would not play in Boston. Thompson told reporters that his ankle was stiff but was not causing him major pain. He also said he was currently functioning at about 70%. The Warriors chose not to risk it. Thompson’s status for Saturday’s game in Milwaukee is unclear.

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Golden State remains undefeated after 23 games, a record start, and holds a 27-game winning streak dating back to last season, tied with the Miami Heat for the second-longest combined streak in NBA history.

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Golden State (23–0) faces Boston (13–9) at 7:30 p.m. ET.

- Jeremy Woo