Brandon Aiyuk is feared to have sustained a torn right ACL, 49ers coach Kyle Shanahan told reporters after San Francisco's 28-18 loss to the Kansas City Chiefs on Sunday at Levi's Stadium, Ali Thanawalla of NBC Sports Bayarea reports.

"We're worried it's an ACL," Shanahan said. "Not confirmed yet. But we'll find out [Monday]."

Aiyuk suffered the injury with 0:37 remaining in the second quarter and was able to walk to the sideline, but was carted to the locker room and ruled out early in the third quarter.

Shanahan was pressed on whether Aiyuk tore his ACL.

"That's what it looks like, but we don't know for sure," Shanahan said. "Just doing the tests and everything with our hands and the trainers and all that. So that's what we fear. That's what it looks like. But we've been wrong before, so praying that we are."

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