The San Francisco 49ers had a tense moment during Thursday's joint practice with the Las Vegas Raiders. Rookie defensive tackle CJ West appeared to buckle his left knee during a one-on-one pass-rush drill, forcing him to leave the session. Head coach Kyle Shanahan later confirmed that West suffered a hyperextended knee , similar to fellow rookie Mykel Williams, who sustained it earlier in camp. Initial evaluations showed no damage to his ACL, and the team remains optimistic about a quick recovery .

“CJ West hyperextended his knee,” Shanahan said, according to 49ersWebzone.com. “We think it's going to be all right, but it looks similar to what happened to Mykel last week. His ACL and everything checked out so far, so hopefully, we'll be lucky.”

The fourth-round pick initially limp

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