SANTA CLARA, Calif. -- With starter Brock Purdy slowly working his way back from the right big toe injury that has kept him out since Week 4, the San Francisco 49ers will again turn to backup Mac Jones on Sunday against the Houston Texans .

It will be Jones' sixth start of the season and fourth in a row after Purdy aggravated the toe injury he initially suffered in Week 1.

This week, Purdy practiced on a limited basis each day, as he did last week, but he was ruled out on Friday's injury report.

Coach Kyle Shanahan said Purdy has been progressing, albeit slowly, and the uncertain nature of the toe injury has made nailing down a return date more difficult.

"It is different dealing with a toe," Shanahan said. "But I'd say it's steadily getting better each week."

Unlike previous

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