San Francisco 49ers star defensive lineman Nick Bosa will miss the rest of the season with a torn anterior cruciate ligament, the team confirmed Monday.

Head coach Kyle Shanahan told reporters at a conference call that Bosa will undergo season-ending surgery on his right knee.

"I talked to Nick last night. You know, it wasn't confirmed until this morning," Shanahan said. "I haven't been able to see him yet today, but talked to him last night, he had a pretty good idea of what we were going to find out today."

Bosa injured himself in the 1st half of the 49ers' victory against the Arizona Cardinals on Sunday. Television coverage of the game showed Bosa on the ground on the sideline after his injury, and later gesturing toward the stands after a visit to the medical tent with a "thumbs dow

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