Tony Stewart is at home resting his broken leg but it is uncertain when he will return to racing.
Stewart broke his right leg in an Aug. 5 sprint car race accident.
Stewart-Haas Racing competition director Greg Zipadelli gave an update on the driver/team owner at Michigan International Speedway on Friday.
"He's supposed to be in bed and keep his leg elevated above his heart for the next seven days ... just to keep the swelling and stuff of that nature down," Zipadelli said.
Stewart will miss his second straight race NASCAR Sprint Cup race on Sunday because of the injury. Austin Dillon will drive in Stewart's place again in the Pure Michigan 400.
"We've been working under the assumption that he's out for the next month or so, or longer," Zipadelli said. "He went to the doctor this week, he had a decent visit -- no setbacks. ... I saw him on Wednesday night, and we spent some time together. ... He's in great spirits. He's going through a transition period. The next seven to 14 days will tell a lot about how (the leg) heals, whether things take. We'll update you guys as we can, but it's going to be a really slow process."
The SHR team is working on plans for replacement drivers for the remainder of the season. Dillon is expected to fill in for at least one more race.
Zipadelli said the team hopes to have a plan in place by next Saturday's race in Bristol, Tenn.
It is an unusual situation for Dillon, who drives for Richard Childress Racing in the Nationwide Series. SHR is affiliated with RCR rival Hendrick Motorsports.
"I've been able to be pretty successful at finishing a lot of laps in my career," Dillon said. "We'll try to be there for a top-15 at the end of the race, and that would be great, and we do that by being there at the end."