Williamson knocked Przybilla down in the fourth quarter of the Kings' 119-115 win Friday. Przybilla got up and shouted at Williamson, and the two had to be restrained by teammates. Williamson was called for a flagrant foul.
He missed Sunday's game against the Lakers.
Nesterovic, averaging 5.9 points and 6.6 rebounds, scored eight points in 20 minutes in the Spurs' 125-124 double-overtime victory over the Clippers on Saturday night.
Linton Johnson, who has played in only one game this season because of a stress fracture in his left knee, was activated from the injured list to take Nesterovic's spot.