After suffering concussion-like symptoms during a qualifying incident at Pocono Raceway, Kurt Busch will miss his fourth straight race.

Busch, 44, who claimed victory at Kansas earlier this year, has a medical waiver that keeps him guaranteed a spot in the playoffs.

On Wednesday, he updated his progress with the following statement:

“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 to be back in the race car.

“This was by far the hardest week emotionally because I do feel the progression of recovery, but racing requires an extreme physical and mental effort, and my body is not 100% able to sustain the intense race conditions. I am making progress and pushing hard each day. I am encouraged by my team of doctors, and we will continue to do everything it takes to get me to 100% to return to competition.

“Thanks to everyone for the continued support and best of luck to the 45 team and Ty (Gibbs) this weekend in Richmond.”

In the No. 45 23XI Racing Toyota Camry, Gibbs, who also competes full-time in the NASCAR Xfinity Series, has been filling in for Busch. He made an impression when he placed 16th in his first race at Pocono, then 17th at the Indianapolis Road Course, and even 10th at Michigan to place in the top ten.

On social media, Gibbs published the following statement: “My thoughts remain with Kurt and I wish him all the best as he continues to recover. He’s been a big help to me while I’m subbing and I hope to make him and the team proud this weekend in Richmond.”

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