Days after the U.S. Department of Justice unveiled more details in a case that has shined a light on decades-long corruption at the heart of soccer, the Swiss authorities have confirmed that they plan to drop one of two cases against Sepp Blatter, a former president of FIFA, the global governing body of soccer.

Blatter had been suspected of improper business conduct and, possibly, embezzlement, according to the Swiss authorities, and he and FIFA were being scrutinized for the awarding of World Cup broadcast rights in the Caribbean in 2005.

The setback was another blow to the credibility of the Swiss prosecution of officials in the world’s most popular sport. The inquiry in Switzerland began in September 2015, four months after a Justice Department indictment outlined corruption schemes that implicated some of soccer’s most senior leaders, businessmen and companies at the time.

While the United States has since successfully prosecuted many of them, the Swiss have failed in their attempts to match their American counterparts in the pursuit of convictions and indictments. Switzerland’s attorney general’s office confirmed the case had been dropped six days after the latest U.S. charges were made public on April 6.