Booker had an MRI on the injury Wednesday.
Booker was injured while playing defense with 2:40 left in the fourth quarter. He froze in place near midcourt, and trainers came out to examine him before two teammates carried him off the floor and into the locker room.
Booker had 19 points and eight assists in 39 minutes. He scored 46 points to lift the Suns past Philadelphia on Monday night.
Now in his third season, he is averaging a team-high 24.5 points per game.
Information from The Associated Press was used in this report.