JOHANNESBURG - The Blitzboks have been dealt a blow ahead of the New York Sevens next weekend.
Christie Grobbelaar has been ruled out after suffering a knee injury on Sunday.
He will be replaced by the uncapped Jayden Nell.
Philip Snyman's charges are joint leaders with Fiji at the top of the World Sevens series.
The Blitzboks have been drawn with New Zealand, France and Australia in Pool A.