Busch, 44, has not been cleared to compete since a qualifying crash at Pocono on July 23rd of this year. He was experiencing concussion-like symptoms and has been fully focused on his recovery since then, missing four Cup races.
The former Cup Series champion will now miss the next two as well, ending the regular season on the sidelines. NASCAR Xfinity Series title contender Ty Gibbs will continue to sub for him in the No. 45 23XI Racing Toyota Camry. Gibbs has a best finish of 10th in four starts so far, coming at Michigan.
