Casilla deemed himself good to go, but A's manager Bob Melvin was unsure of the right-hander's availability for Sunday. Casilla wasn't used in the A's 4-3 win over the Yankees.
The veteran pitcher, who underwent an X-ray that came back negative, said Sunday he often stands in the spot he occupied in the dugout when hit and that the incident likely won't scare him away from doing so again.
"I think I just have to be a little more careful," Casilla said. "It's a really great spot to watch the game, but I think I just have to be a little more aware of the ball coming at me."
Casilla said he saw the ball aimed at his head, so he turned and it caught his shoulder.
"I came out to watch the game because they told me I had the day off," he said, "and it was shocking to see that line drive."
• Melvin said right-hander Andrew Triggs will get a cortisone shot in his left hip with the hope that it helps reduce inflammation in the area.
Jane Lee has covered the A's for MLB.com since 2010.