49ers DE Nick Bosa out for season with torn right ACL

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SANTA CLARA, Calif. -- Even as the San Francisco 49ers held out hope that a Monday morning MRI would show that defensive end Nick Bosa had avoided a serious right knee injury, Bosa himself was already resigned to what the imaging would indicate.

Which is why, when Kyle Shanahan spoke to Bosa after the win against the Arizona Cardinals on Sunday night, Bosa told his coach to expect the worst: a torn ACL in his right knee.

As it turned out, Bosa, who has torn ACLs in both knees previously, was correct. The tests revealed he did have a torn right ACL, and he will miss the rest of the season, Shanahan said Monday afternoon.

"He was pretty confident that he did it," Shanahan…