The Warriors said Sunday that Speights had an MRI exam that showed a moderate strain, and the forward will be re-evaluated in one week.
Golden State trails Memphis 2-1 in the Western Conference semifinal with Game 4 on Monday night. The timetable could allow Speights possibly to return for Game 7 on May 17.
Speights was hurt in the fourth quarter Saturday night of a 99-89 loss to Memphis, and he hopped off the court to the locker room. He had nine points in the game, including six in a 41-second span just before hurting his calf.