He suffered the injury during the second quarter, grabbing his leg after a drive six minutes before halftime. He left the game moments later.
Booker had 10 points, two rebounds and an assist at the time of the injury. Phoenix went on to win 104-96.
Suns coach Monty Williams said after the game that he didn't yet have an update on Booker. Booker will be evaluated by the Suns' medical staff on Wednesday.
Booker suffered a left hamstring strain last January and missed four games.
He's averaging 23.9 points, 5.1 rebounds and 4.7 assists.