Jackson suffered a head injury during Thursday's game against the Kings and won't return. He finished with two points (1-2 FG), one rebound and one assist in five minutes.
The Pacers haven't released any specifics yet, so for now, fantasy managers will have to assume that Jackson is questionable at best to play Friday against the Trail Blazers. If he's held out, the Pacers could turn to Jarace Walker to serve as starting center Myles Turner's top backup.