Brock Purdy, 49ers begin talks on extension

Brock Purdy - Talking extension with Niners

Brock Purdy - Ruled out for Week 18

Brock Purdy - No practice Thursday

Brock Purdy (elbow) will not start in Week 18

Brock Purdy - Won't start in season finale

Brock Purdy (elbow) likely to miss Week 18

Brock Purdy - Unlikely for Week 18

Brock Purdy dealing with nerve issue in elbow