The 49ers have committed to Brock Purdy with a big extension. But the key to that deal is the guy standing behind him in the backfield.

The San Francisco 49ers are bringing back a familiar face under center. According to the Athletic's Matt Barrows, the 49ers are signing quarterback Nate Sudfeld after Sudfeld threw in a wide receiver workout Monday.

Kyle Shanahan may not want to see Mac Jones in extended action, either. Jones had 18 dropbacks last game. Even if Jones plays the first quarter, or even the first half, that leaves three quarters or a full half for Carter Bradley.