"He's doing better. He felt like he could throw yesterday, but you got to do what's right and do what's cautious here," Bochy said. "He's moving around pretty good."
Casilla injured his leg in the ninth inning of Friday's 4-3 win against the Cubs while fielding Darwin Barney's infield single.
Reliever Sergio Romo got the save in Saturday's 2-1 win. Bochy said Romo, who returned Saturday from his own knee injury, is completely recovered, and the manager chose to use Romo for the save in Sunday's 2-0 victory as well.