The injury occurred in the first quarter of Indiana's 118-108 road win against the Brooklyn Nets.
The team's 2015 first-round draft pick is averaging 14.8 points and 6.8 rebounds in four games this season.
Pacers point guard Edmond Sumner has a nondisplaced fracture of his right third metacarpal, the team said.
Sumner won't need surgery and will be reexamined in three weeks.
Sumner is averaging seven points and two assists in three games this season.