Team spokesman Cory Walton said Friday that X-rays performed on Jones' ankle showed no fractures, and an MRI confirmed the injury was a sprain.
Jones was hurt in the first half of the 20th-ranked Blue Devils' 74-73 victory over No. 5 North Carolina on Wednesday. He landed awkwardly after a shot, had to be helped off the court by two teammates and spent the second half on crutches.
Jones' injury leaves already-thin Duke (20-6, 9-4 Atlantic Coast Conference) with just three healthy guards on scholarship. He started each of the team's first 26 games, averages 11.2 points and has made a team-best 59 3-pointers.