Kristaps Porzingis will be absent as the Boston Celtics aim to seal their place in the last four of the NBA's in-season tournament.
Porzingis has missed the Celtics' last three games after sustaining a calf injury in a defeat to the Orlando Magic on November 24.
And the Latvian, who joined Boston from the Washington Wizards in the off-season, will not recover in time to face the Indiana Pacers on Monday.
Porzingis is averaging 18.9 points, just slightly below his career average (19.6), across his 15 games this season. Tyrese Hailburton, meanwhile, is a doubt for the Pacers.
The winner of Monday's quarter-final will head to Las Vegas for the semi-finals.