SANTA CLARA — Rookie quarterback Trey Lance chipped a bone in a finger and is out at least the next week, coach Kyle Shanahan announced Monday. Lance's right, throwing hand struck the helmet of a Raiders' defender during Sunday's preseason win over the Raiders. 'It's a microchip of a bone that's off. It's a chip fracture, which is worse than a jam and why it won't heal on its own,' Shanahan said on a media conference call. 'He can't take snaps right now. We'll rest it for seven days and hopefully he'll be good next Monday when we get to practice.

https://www.mercurynews.com/2021/08/30/49ers-trey-lance-sidelined-after-chipping-bone-in-finger-on-raiders-helmet

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