SANTA CLARA, Calif. — San Francisco star defensive end Nick Bosa left the win over the Arizona Cardinals with a knee injury in the first half and the 49ers are waiting for word on the extent of the injury.

Bosa left the field favoring his right leg after a third-down pass rush in the first quarter. He went immediately to the medical tent and appeared to give a thumbs-down signal to someone in the crowd.

Bosa tested the knee briefly on the sideline before going back to the locker room. He was ruled out of the game at halftime.

Coach Kyle Shanahan said initial tests did not show a tear of Bosa’s ACL, but he will need more tests to completely rule that out and to learn the severity of the injury.

“There is concern because of how he feels,” Shanahan said. “They did the tests and stuff on t

See Full Page