As a precaution, Roush Fenway Racing and Wood Brothers Racing have decided to hold Trevor Bayne out of competition for another week. Barring any unforeseen circumstances, the plan is to have Bayne return to the Nationwide Series at Chicagoloand Speedway in the STP 300.
Two weeks later, Bayne would return to the No. 21 Sprint Cup Ford in the Heluva Good! Sour Cream Dips 400 at Michigan International Speedway.
RFR President Steve Newmark said:
By all standards Trevor had a great week. His symptoms have completely subsided. He tested at Virginia International Raceway on Tuesday, had one of the fastest Nationwide Series cars on the race track and his team was extremely pleased with his progress. As a result, we plan to have him back in competition next week in Chicago, and have consulted with his doctors at the Mayo Clinic and the NASCAR medical staff about that timetable. … Although Trevor would have preferred to compete in all 900 miles this weekend, he respects and understands our decision and will shift his considerable focus to his return at Chicagoland next weekend.
Ricky Stenhouse Jr, who won his first career Nationwide Series race at Iowa Speedway recently  will fill in for Bayne in the No. 21 Motorcraft/Quick Lane Ford in the Coca-Cola 600 at Charlotte Motor Speedway. This will be Stenhouse’s Sprint Cup debut.
Obviously its not the circumstances that you want to make your first Sprint Cup start. But you grow up dreaming about this moment and I am excited and grateful for the opportunity; to not only make my first start, but to be able to drive the No. 21 Ford of the Wood Brothers in one of the biggest races of the season. Trevor is a very good friend of mine and he’s going to be around this weekend and I know that his help with the transition will be instrumental. Hopefully we can give him an effort that will make him proud before we turn the car back over to him for the rest of the season.
Bayne has been suffering from an undisclosed illness  that has resulted in blurred vision, pain, and nausea. He has missed  several races due to this illness. He seems to be recovering, but RFR and WBR want to hold out until they feel that he is back to full strength.