FIFA secretary general Jerome Valcke has been put on leave and released from his duties, effective immediately, the governing body has said.
Another of those arrested in Zurich on May 27 - Jeffrey Webb, a former president of the CONCACAF confederation representing North American, Central American and Caribbean countries - has already been extradited to the US.
The US and Swiss attorneys general staged a news conference on Monday updating on their separate inquiries into allegations of corruption at FIFA.
Michael Lauber, the Swiss justice chief, confirmed his country's authorities are investigating a World Cup television rights contract signed off by FIFA president Sepp Blatter that was sold to former FIFA official Jack Warner for a fraction of their true value.
Lauber said that FIFA had sent prosecutors its explanation for the contract sold to the Warner-controlled Caribbean Football Union (CFU) for 600,000 US dollars (£389,000) - Warner's company later sold them on for an £11million profit.
Meanwhile, the US attorney general Loretta Lynch announced fresh arrests and charges are likely as a result of the separate FBI investigations into the FIFA corruption scandal. Lynch, speaking at the same news conference as Lauber, said new charges and arrests against ''individuals and entities'' were anticipated.
Lauber also revealed that assets including flats in the Swiss Alps and western Switzerland had been seized by his investigators, on suspicion of being used for money-laundering purposes, and that 121 different bank accounts have been brought to the attention of the investigating task force.
In May, the US justice department announced indictments against 18 people on football-related corruption charges - four have pleaded guilty to charges.
Lynch told the news conference on Monday: "Separate and apart from the pending indictment our investigation has expanded since May. The scope of our investigation is not limited and is following the evidence where it leads.
"We do anticipate pursuing additional charges against individuals and entities."
Asked if Blatter was under investigation or if it might interfere with his travel plans - the FIFA president did not travel to the women's World Cup in Canada in June following the arrests in May - Lynch added: "I'm not going to comment on individuals and I am not able to give you information about Mr Blatter's travel plans."
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