SANTA CLARA — Mac Jones came to the 49ers to back up Brock Purdy after washing out in both New England and Jacksonville, working his hardest to be ready for called upon.

It happened sooner than anyone imagined when Purdy came out of a season-opening 17-13 win over Seattle with toe and left shoulder injuries which could sideline him for multiple games.

If that’s not enough to worry 49ers fans, Adrian Martinez will be promoted from the practice squad as the backup and he’s been with the team all of two weeks.

“It’s the front side of the season here, and I feel prepared,” Jones said Friday. “I’ve been working for this and fortunate to have started, I think this is my 50th game in the NFL, so I have my routine down, and I’m looking forward to the opportunity.”

Jones will start Sunday’s gam

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