Vickers is scheduled to drive for Michael Waltrip Racing at Martinsville next weekend, and Sadler has a deal with sponsorship to run a fourth JGR car at Kansas and Talladega.
Kenseth passed JGR teammate Kyle Busch 13 laps from the end to win the Southern 500 on Saturday night, his third victory in his debut season after a successful stint with Roush Fenway Racing.