Most recently, he flew home from the tour of the West Indies for treatment on a a hip injury, which meant he missed the fourth and fifth Tests of a series England ultimately lost 1-0.
"With illness, injury and treatment Brad has gone past the point where he can be ready for the Tour, " said Brailsford, who is also performance director of British Cycling.
Dozens of doctors from around the country came to tour the patient-friendly clinics, which were complete with atriums that let sunlight into the treatment theaters.