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49ers' Brandon Aiyuk tears ACL, MCL; Deebo Samuel in hospital

SANTA CLARA, Calif. -- Less than 24 hours after wide receiver Brandon Aiyuk injured his right knee against the Kansas City Chiefs, the San Francisco 49ers got the bad news they were expecting.

Aiyuk tore the anterior cruciate and medial collateral ligaments in his right knee, which will require surgery and end his 2024 season after just seven games, coach Kyle Shanahan announced Monday.

What's more, the illness that limited wideout Deebo Samuel to four snaps against the Chiefs is technically a form of pneumonia, according to Shanahan. Samuel has some fluid buildup in his lungs and remains in a local hospital after checking in Sunday night.