Saunders was struck on the side of his left shin by a line drive in the first inning of his start Monday and was forced to leave the game.
"The official doctor prognosis is that it's a deep bone bruise," Saunders said.
When Saunders next start will come is up in the air as the club could decide to move him up in the rotation given that he threw so few pitches before exiting.
"I felt like I got shortchanged," Saunders said. "I felt good out there, didn't want to come out."