Candidates were required to submit three or more letters of nomination by midnight on Tuesday in order to be placed on the ballot.
It wasn't clear which of the nine people who had declared an intention to run had failed to submit three letters of nomination, and US Soccer's nominating and governance committee said in a statement on Wednesday that it wouldn't name the candidates until background checks on each of them had been completed.
The background checks are required by the body's bylaws to ensure that a candidate has "no conviction or no contest plea to a felony or crime of moral turpitude".
Boston lawyer Steve Gans, one of the first to announce his candidacy for the job, also said he had the needed support.
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Others who announced their plans to run were federation vice president Carlos Cordeiro, Soccer United Marketing President Kathy Carter, New Jersey lawyer Mike Winograd and Massachusetts football official Paul Lapointe.
Sunil Gulati, president of the federation since 2006, said this month he would not seek re-election in the wake of the US failure to qualify for the 2018 World Cup.
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