Robinson III had missed most of training camp and the preseason with a high ankle sprain, and the necessity now for a surgical procedure will extend his original two-month timetable on a return for an additional two to four weeks, league sources said.
Robinson suffered the injury in a September 28 practice scrimmage, crumbling to the floor after a drive to the basket.
The Pacers consider Robinson, 23, is a key part of the franchise’s rebuild and plan a prominent role for him in the post-Paul George era.
Robinson, the 2017 NBA Slam Dunk champion, blossomed into a solid contributor last season. He averaged a career-high 6.1 points and 3.6 rebounds in 20 minutes a game. Robinson III shot nearly 40 percent from the three-point line.
After leaving Michigan after his sophomore season, Robinson was a second-round draft pick who had stops with Minnesota and Philadelphia before landing with the Pacers for the 2015-’16 season.