Overview

• Rookie defensive tackle CJ West hyperextended his left knee during Thursday’s joint practice in Las Vegas and is walking more comfortably after initial checks showed an intact ACL pending further imaging.
• Eight defensive linemen, including Nick Bosa, Robert Beal Jr., Jordan Elliott, Kevin Givens, Sam Okuayinonu, Mykel Williams, Yetur Gross-Matos and Bradlee Anae, have been sidelined with injuries during training camp.
• The 49ers signed veteran defensive ends William Bradley-King and Demone Harris to one-year deals this week to bolster a depleted front four.
• Head coach Kyle Shanahan acknowledged there are few healthy starters on defense and said he may increase starter reps in the next preseason game to better simulate regular-season workloads.
• Coaches remain cautiously optimistic about preliminary medical evaluations but stress that final diagnoses for West and other injured linemen will depend on more definitive tests.