What happened: Kyle Shanahan confirmed Wednesday that Collins tore his patellar tendon in practice. [UPI](https://www.upi.com/Sports_News/NFL/2026/09/09/australia-Alfred-Collins-San-Francisco-49ers-out-season/1781788956651/)

Why it matters: His absence reduces depth on the defensive interior before the opening game.

What to watch: Watch how defensive tackle snaps are distributed in Thursday's opener in Melbourne.