SANTA CLARA, Calif. — San Francisco star defensive end Nick Bosa tore the ACL in his right knee and will miss the rest of the season.

Bosa hurt his knee in the first half of a win over the Arizona Cardinals on Sunday and didn't return to the game. Bosa gave a thumbs-down to someone in the crowd after the injury, but initial tests did not show a torn ACL although coach Kyle Shanahan said Bosa feared that he had.

More tests were done Monday showing that Bosa had torn his ACL and his season was done.

“Obviously he’s bummed,” Shanahan said. “But Nick can handle anything and he’s going to handle it like he always does, which will be great. But obviously he was bummed out from it, not being able to finish out this year, especially how good of a year he was having so far.”

Shanahan said there

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