What happened: The San Francisco 49ers placed wide receiver Christian Kirk on injured reserve. Kirk suffered a meniscus injury during Thursday's practice session. Head coach Kyle Shanahan confirmed the team has not determined whether the injury will require surgery.

Why it matters: The roster move sidelines a key perimeter target as San Francisco holds a 6-1 record atop the NFC West. The injury further impacts receiver depth as the front office explores market additions ahead of the trade deadline.

What to watch: The 49ers prepare to face the Las Vegas Raiders on Sunday without Kirk available.