Head coach Kyle Shanahan revealed Monday that defensive lineman CJ West broke his thumb and will undergo surgery on Tuesday. Despite the injury, there remains a chance West could play in the 49ers' Week 4 matchup against the Jacksonville Jaguars, depending on what he can do—if anything—in practice this week.
"I don't know exactly how he did it, but he broke his thumb," Shanahan explained during his conference call. "That's why he is needing surgery. He'll have a chance, they say. We'll see how it goes this week, but he'll have a chance at the end of the week with a cast.
"And if not, he should be good the following week. But we've got to see how this week goes with him."
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The 49ers also saw rookie defensive lineman Mykel Williams briefly leave Sunday's game with a wrist injury in the second quarter. He returned before halftime, but Shanahan listed him as day-to-day heading into Wednesday's practice.
With Bosa sidelined for the season, the health of West and Williams will be pivotal as San Francisco leans on its young defensive front to maintain pressure on opposing offenses. Shanahan praised the group's resilience after Bosa exited against the Cardinals.
"We needed guys to step it up to play along with Nick, and now that he's out, you need them that much more," Shanahan said. "But I had definitely been happy with those guys. I think they've done better each week.
"I thought Mykel had a really good game yesterday. I think [DE Bryce] Huff's done some real good things, [DE] Sam [Okuayinonu], all our edge players, I think have been contributing, and hopefully, they continue to get better throughout this year."
Click here to read all of Shanahan's injury updates from Monday's conference call.
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