SAN FRANCISCO -- San Francisco 49ers Pro Bowl defensive end Nick Bosa suffered a torn ACL during Sunday's victory against Arizona and will need season-ending surgery, sources told ESPN's Adam Schefter on Monday.

Testing revealed a clean tear in his right knee, sources told ESPN.

San Francisco 49ers defensive end Nick Bosa before the first half of an NFL football game against the New Orleans Saints, Sunday, Sept. 14, 2025, in New Orleans. AP Photo/Butch Dill

San Francisco 49ers' Nick Bosa walks off the field during the first half of an NFL football game against the Arizona Cardinals, Sunday, Sept. 21, 2025, in Santa Clara, Calif. AP Photo/Godofredo A. Vásquez

Bosa left Sunday's 16-15 victory with about a minute left in the first quarter. On the play, Bosa was rushing Cardinals

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