SANTA CLARA, Calif. -- Barring a significant last-minute change, the San Francisco 49ers will start Mac Jones at quarterback for a second consecutive week Sunday against the Arizona Cardinals .

Starter Brock Purdy is listed as questionable for Sunday as he recovers from the toe injury that kept him out last week against the New Orleans Saints . And though Purdy was a limited participant in practice all three days this week and made what coach Kyle Shanahan called "a lot of progress" in his recovery, Shanahan wasn't keen on Purdy's chances of starting against Arizona.

"I think it's highly unlikely that he will start," Shanahan said Friday. "We're just trying to see where he's at to see if he can be a [ No. ] 2 or an emergency [ No. ] 3."

Shanahan said whether Purdy is i

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