Robinson underwent surgery to repair the medial and lateral ligaments in his left ankle, suffered on Sept. 29 in a scrimmage during practice. He had missed most of training camp and the preseason because of the ankle injury.
Robinson's loss is a blow to the Pacers, who considered him a key part of the franchise's rebuild 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 per game. Robinson shot nearly 40 percent from the 3-point line.
After leaving Michigan following his sophomore season, Robinson was a second-round draft pick who had stops with the Minnesota Timberwolves and Philadelphia 76ers, before landing with the Pacers for the 2015-16 season.