In an interview with the Portuguese outlet published on Saturday, Solo claimed Blatter "grabbed my ass" at FIFA's Ballon d'Or awards ceremony in January 2013, where Solo presented the FIFA Women's World Player of the Year award on stage alongside Blatter.
Solo was at the ceremony to present teammate Abby Wambach with the women's player of the year award.
"In the case of Sepp Blatter, I went on the stage, I was nervous for the presentation.
Solo was at the awards show to present the women's player of the year award to her USA teammate Abby Wambach. She was accompanied on stage by Blatter.
"I was in shock and completely thrown off", Solo told the Guardian about the incident. She said she's disappointed in her colleagues who have been victims but who have not spoken out about their own experiences. It was the Ballon d'Or I was presenting. That's the way I've always handled things.
"I had Sepp Blatter grab my ass".
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Last month, Solo posted on Instagram in the wake of revelations about the Hollywood producer Harvey Weinstein, and on Friday she reiterated her stance to the Guardian that more must be done to combat sexual harassment in women's sports. After that I didn't see him and that was kind of bad. I've seen it amongst players in the locker room.
According to The Guardian, Blatter has denied the incident taking place, saying: "This allegation is ridiculous".
Blatter was president of Federation Internationale de Football Association from 1998 until 2015 until he was banned for corruption.
She said that sexual harrassment at the hands of male officials was a common problem in women's football. In 2004, he flared tempers when he suggested women female soccer players should wear "more feminine clothes", including "tighter shorts".
When asked why she had never brought it up previously, Solo admitted it is because she usually like to take it up with the person directly, rather than flush it out to the press.