Tony Stewart will miss the rest of the Sprint Cup Series season with a broken right leg, reports USA TODAY's Nate Ryan.
Stewart was injured in a four-car wreck during the Front Row Challenge at Southern Iowa Speedway on August 5. He had surgery the next day and had missed the past two races.
Veteran driver Mark Martin and Austin Dillon will drive in Stewart's place in the final 13 races of the season.
"Obviously, I'm disappointed to be out of the Bass Pro Shops/Mobil 1 Chevy for so long, but the team is in very good hands with Mark Martin and Austin Dillon," Stewart said in a statement. "Mark is someone I've looked up to my entire career and I have a tremendous amount of respect for him. Austin is a great young talent, and he showed that Sunday at Michigan. This isn't a situation anyone wanted, but we're going to make the best of it. In the meantime, my focus is on getting healthy and getting back into my Bass Pro Shops/Mobil 1 Chevy."