Hope Solo, the former goalie of the USA women's national soccer team, said the head of Federation Internationale de Football Association groped her in 2013 as they were about to present an award together.
During an interview with Portuguese outlet Expresso, she claimed that she "had Sepp Blatter grab my ass".
She told Expresso that 'After that I didn't see him and that was kind of bad.
She had been "nervous" before the event, and was left "in shock" just seconds before they were to go on stage for what would be one of the biggest moments in her friend's life, Solo revealed.
Blatter has denied the allegations. Solo used the opportunity to write about the "rampant" culture of harassment in sports.
Solo has taken to social media to praise those who have spoken out against sexual harassment using the hashtag #MeToo.
"Can I talk about that?" she continued.
Solo is the United States' record appearance-maker with 202 caps but was handed a six-month suspension by her national federation after branding Sweden's players "a bunch of cowards" in the aftermath of her team's 2016 Olympic quarter-final defeat on penalties. "I did not get to tell him directly 'Do not ever touch me!' That's the way I've always handled things". Silence will not change the world! In January 2004, Blatter suggested women should where "tighter shorts" because "female players are pretty". Female players are pretty, if you excuse me for saying so, and they already have some different rules to men - such as playing with a lighter ball. "And I wish more female athletes would speak out about their own experiences".
Blatter, 81, was elected FIFA's president five times between 1998 and 2015, but he lost his position due to ethics breaches.