SANTA CLARA — One 49ers preseason game to go, this Saturday at 5:30 p.m. against the Los Angeles Chargers. An intial 53-man roster is due Tuesday, straight from the desk of general manager John Lynch.

Injury designations and other unexpected twists are sure to come. But let’s cut to the chase and workshop these 49ers amid a constant stream of newcomers to camp (* denotes starter):

QUARTERBACK (2)

*Brock Purdy

Mac Jones

In the mix: Carter Bradley, Tanner Mordecai

Non-football-injury list: Kurtis Rourke

Analysis: Kyle Shanahan should sit Purdy for Saturday’s finale against the visiting Chargers, rather than risk injury behind a makeshift line and patchwork receivers. Jones, after spraining his knee in Saturday’s win at Las Vegas, appeared in a good mood as he watched Thursday’s practi

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