Solo, 36, presented on the stage to present Federation Internationale de Football Association women's world player of the year alongside Blatter, to her colleague and striker Abby Wambach on the United States of America team that had won the gold medal at the London Olympics.
US forward Alex Morgan has said that Blatter failed to recognize her at the annual awards event in 2012, even though she was one of three nominees for the women's Player of the Year.
Blatter, 81, was Federation Internationale de Football Association president from 1998 until 2015, when he was banned in relation to a payment of two million Swiss francs (€1.7m) to former UEFA chief Michel Platini. "Can-I-talk-about-that-" target="_blank">Expresso, Solo said, "I had Sepp Blatter grab my ass". It was the Ballon d'Or I was presenting.
Blatter assaulted her at the 2013 Ballon d'Or awards ceremony, Solo said.
Solo posted on Instagram last month a message to women participating in the #MeToo hashtag and speaking out against sexual assault.
FIFA President Joseph S. Blatter talks with Hope Solo of United States of America after the FIFA Women's World Cup Final match between Japan and US at the FIFA Women's World Cup Stadium on July 17, 2011 in Frankfurt am Main, Germany. "I had to submit to my co-fellow [Abby Wambach, victor of the Golden Ball 2013, editor's note] the biggest prize of his career, and celebrate with it this time, so I dedicated all my attention", she also added.
In a brief answer to the BBC when quizzed on the allegations, Blatter's spokesperson refuted the assertions made by Solo. Solo used the opportunity to write about the "rampant" culture of harassment in sports. I didn't get to tell him directly "don't ever touch me".
She said: "Yes, I've seen it throughout my entire career". That needs to change.
"I've seen it not just with coaches, I've seen it with trainers, doctors, and our press officers. I don't know why more players don't speak out".
Asked why she had not spoken out about the Blatter incident before, Solo said she always tries to confront directly people, including team-mates, when it happens.
Blatter also famously argued in 2004 that players could boost the popularity of the women's game by wearing tighter shorts.
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