What happened: Josh Allen took a helmet to his left knee late in the fourth quarter and grimaced before staying in. He added one more designed run on the next drive. He limped postgame while leaning to his right.

Why it matters: Allen is Buffalo's starting quarterback and drives the Bills offense. His practice status will shape preparations entering Week 4. Buffalo cannot replace his rushing and passing production with a backup.

What to watch: Watch Buffalo's practice participation and official game designation ahead of Week 4.