ST. LOUIS -- St. Louis Rams quarterback Sam Bradford was very limited in practice, leaving his availability in doubt for Sunday's game at San Francisco.

"He didn't do much at all," coach Steve Spagnuolo said. "He's still a little sore, so we'll see where we're at tomorrow."

Bradford aggravated a high left ankle sprain in last week's loss to the Cardinals and didn't practice Thursday. Spagnuolo thought Bradford hadn't improved much since then.

Bradford, who was listed as questionable, was not made available to reporters.

Backup A.J. Feeley would make his third start if Bradford isn't able to go. One of Feeley's starts was the Rams' best game of the year, a 31-21 victory over the New Orleans Saints.

"It helps when you get reps in practice," Feeley said. "But I fully anticipate Sam being ready to go."

The Rams re-signed quarterback Tom Brandstater to the practice squad as insurance, releasing linebacker Eddie Jones.

Bradford didn't practice much leading up to the Arizona game in early November, but started in an overtime loss after missing two games with the injury. He had been listed as questionable.

"We're going to make sure he's OK," Spagnuolo said. "It's kind of like the Arizona game, we didn't play him until we knew he could get himself in and out of trouble."

Spagnuolo said Bradford was hurt making a throw, rather than getting the ankle rolled on by a tackler.