Mac Jones being the 49ers’ starter might last just one week.

The San Francisco quarterback got the start in Week 2 after Brock Purdy suffered shoulder and toe injuries that were originally expected to sideline him for a few weeks.

But coach Kyle Shanahan told reporters on Tuesday Purdy has a chance to play Sunday against the Arizona Cardinals. The quarterback was limited in Wednesday’s practice.

Purdy could also be the emergency third quarterback Sunday.

Jones was named the Week 2 starter and helped lift the 49ers to a 26-21 win over the New Orleans Saints. The former New England Patriots signal caller went 26-of-39 for 279 yards and three touchdowns.

This is Jones’ first season in San Francisco after he signed a two-year deal with the team in March after spending a

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