SANTA CLARA, Calif. -- The San Francisco 49ers ' worst fears were confirmed Monday when tests showed star defensive end Nick Bosa suffered a torn ACL in his right knee, sources told ESPN's Adam Schefter.

The tear is clean, but Bosa will still require season-ending surgery, sources told ESPN.

For Bosa, this is the second season-ending ACL injury of his career. He tore the ACL in his left knee in a Week 2 win against the New York Jets in 2020. He also had a partially torn right ACL when he was a senior in high school (2015).

Bosa left Sunday's 16-15 win against the Arizona Cardinals with about a minute left in the first quarter, went to the locker room and did not return. After the game, coach Kyle Shanahan said the initial test of the ACL on the sideline hadn't shown a tear but

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