British long jumper Greg Rutherford has had his sperm frozen before competing at the Rio Olympics because of fears about the Zika virus.
Cyclist Tejay van Garderen and golfers Vijay Singh and Marc Leishman have already said they will not compete at the August Games because of Zika.
The mosquito-borne virus, which is linked to serious birth defects, has been declared a global public health emergency by the World Health Organization
Last week, the WHO said it would examine the risks of staging the Olympics in the Brazilian city, having rejected calls from more than 100 leading scientists to move or postpone the Games.
Greg Rutherford’s partner, Verrill, said she will not attend.