Two days after the 49ers settled on Shaun Hill as their starting quarterback, Hill was on the sideline with a sore back while his understudies ran practice.
Coach Mike Singletary said Hill strained his lower back during Tuesday's practice by pushing himself too hard. Hill went through the early stages of Wednesday's session without a hitch. But after one throw in the team portion of the practice, he was finished for the day.
Though Hill gave a thumbs-up signal while jogging into the locker room and said he'd "definitely" play Saturday against the Dallas Cowboys, Singletary said he wasn't so sure. "It'll be day-to-day," Singletary said.