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, Nick Wagoner of ESPN reports.

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.

"I think it started acting up in the middle of the night Saturday night or early Sunday morning and then it just kind of evolved as the day went," Shanahan said of Samuel. "Once we found out he had the fluid in his lungs and stuff after the game, then I believe they sent him over there."

Shanahan said there's no timeline yet for when Samuel could return, though that should clarify over the next few days.

Aiyuk, meanwhile, is not expected back at all this season. Further tests confirmed Monday what Shanahan was expecting Sunday night. After a 28-18 home loss to the Chiefs, Shanahan said all signs pointed toward a torn ACL but a closer look was still needed and that the Niners were "praying" they were wrong. They weren't.

Aiyuk's injury happened with 48 seconds left in the second quarter. Quarterback Brock Purdy squeezed a pass to Aiyuk between Kansas City defensive backs Chamarri Conner and Trent McDuffie for a gain of 15 yards. As Conner and McDuffie converged on Aiyuk, his knee appeared to hyperextend.

Niners medical personnel immediately ran on the field to tend to Aiyuk, who stayed down for a couple of minutes before slowly limping to the sideline and the blue medical tent. He was soon taken to the locker room on a cart.

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