The Spanish basketball player said today there is too much uncertainty about the situation in Brazil and anyone going to Rio de Janeiro for the games should "think about" whether it's worth the risk.
The Chicago Bulls player said other Spanish athletes have also expressed their concerns about the virus and are also considering skipping the games.
"It wouldn't surprise me to see some athletes deciding not to participate in the games to avoid putting their health and the health of their families at risk," Gasol said, adding that he was among the athletes making such considerations.
Without giving names, Gasol said he talked to other athletes who told him they may not participate in the games.
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"Some of these athletes are planning to have children in the near future and this could affect them, it could affect the health of their kids and their wives," he said at an event for one of his sponsors in Madrid. "Their health should come first."
Brazil has been badly hit by Zika, the mosquito-borne virus linked to severe birth defects and possible neurological problems in adults.
"I hope the national Olympic committees and the health organizations can be as clear as possible about the risks in Brazil so athletes can decide whether or not to take risks," he said. "I don't think we've been told enough about it.