Kyle Anderson likely suffered a strained MCL to his left knee during the Spurs' loss on Sunday to the Thunder.
Anderson will undergo an MRI on Monday for further clarity on the injury and a timetable for return.
Anderson's injury was of the non-contact variety. X-rays taken initially at the arena were negative.
On a drive to the basket on which he was fouled, Anderson came down awkwardly and immediately grabbed at his knee.