49ers: QB talk on Garoppolo, Purdy, Mayfield, Lance, Brady, Kaepernick
The NFL's emergency quarterback rule, explained
Emergency quarterbacks for all 32 NFL teams -- Punters, high school QBs and more - ESPN
NFL approves third QB rule: Projecting every team's situation for 2023, plus possible options for all 32 clubs
NFL emergency QB rule is back - Cincy Jungle
49ers backup QB: Kyle Juszczyk is Brock Purdy's emergency backup after Jimmy Garoppolo injury - DraftKings Network
Brock Purdy earns 49ers roster spot as third QB; Jimmy Garoppolo QB2 vs. Bears – NBC Sports Bay Area & California
49ers Backup QB Josh Johnson Ruled Out After Brock Purdy Injury - Sports Illustrated
49ers quarterback Brock Purdy is unlikely to play in San Francisco's preseason opener