Busch, 44, who won earlier this year at Kansas, remains locked into the playoffs via a medical waiver.<br>He released the following statement on Wednesday, updating his recovery:<br>"Brain injury recovery doesn't always take a linear path. I've been feeling well in my recovery, but this week I pushed to get my heart rate and body in a race simulation type environment, and it's clear I'm not ready ...<a class='more' href='https://www.motorsport.com/nascar-cup/news/kurt-busch-sidelined-concussion-ty-gibbs-richmond/10351515/?utm_source=RSS&utm_medium=referral&utm_campaign=R SS-NASCAR&utm_term=News&utm_content=www'>Keep reading</a>

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