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RIO DE JANEIRO, BRAZIL - AUGUST 09: An injured Sonny Bill Williams of New Zealand is stretchered off during the Men's Rugby Sevens Pool C match between New Zealand and Japan on Day 4 of the Rio 2016 Olympic Games at Deodoro Stadium on August 9, 2016 in Rio de Janeiro, Brazil. (Photo by David Rogers/Getty Images)

RIO DE JANEIRO, BRAZIL - AUGUST 09:  An injured Sonny Bill Williams of New Zealand is stretchered off during the Men's Rugby Sevens Pool C match between New Zealand and Japan on Day 4 of the Rio 2016 Olympic Games at Deodoro Stadium on August 9, 2016 in Rio de Janeiro, Brazil.  (Photo by David Rogers/Getty Images)