The 41-year-old lacks the drive to compete in the sponsors’ race and is keen to not step on it before the Silverstone showpiece starts.
Clark called last year’s incident at Oakmont the “lowest point” of his career.
Pollock is the England player Springbok fans love to hate.
The Lancashire seamer impressed in Wednesday’s Vitality series opener against India, which was washed out.
Cheltenham Gold Cup-winning jockey has died aged 65.