Zurich - FIFA president Sepp Blatter said Thursday that the scandal-tainted football body faces "more bad news" and that officials accused of corruption had brought shame and humiliation on the organisation.
Blatter did not raise the many calls made for him to resign or Friday's election, as he opened FIFA's annual congress one day after seven top football officials were arrested as part of a US corruption inquiry.
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"The next few months will not be easy for FIFA. I am sure more bad news will follow but it is necessary to begin to restore trust," Blatter told the congress.
"We cannot allow the reputation of football and FIFA to be dragged through the mud any longer. It has to stop here," he added.
Blatter called the scandals "unprecedented" and said the "actions of individuals bring shame and humiliation on football and demand action and change from us all".
"The events of yesterday have cast a long shadow over football and over this week's congress."
The football president said FIFA cannot be an "exception" to rules on corruption and added "we will cooperate with all authorities to make sure that anyone involved in wrongdoing from top to bottom will be discovered and punished."
In his address, IOC boss Thomas Bach urged FIFA to co-operate fully with US authorities to shed 'full light' on the corruption allegations facing football's governing body.
Bach, the president of the International Olympic Committee (IOC), acknowledged these are 'sad and difficult days' for FIFA and said Blatter's organisation must cleanse itself of any wrong-doings.
"I would very much like to encourage you to continue and strengthen your co-operation with the relevant authorities to shed full light on the concerned methods and to take all necessary measures to address such grave allegations," said Bach.
"The IOC knows from its experience that this fight is challenging and can be very painful.
"We also know there is no other way to ensure credibility, we have seen this in business, in politics and society."
Despite the storm, Blatter is favourite to win a fifth term in a vote at the congress on Friday. His only challenger is Prince Ali bin al Hussein of Jordan, a FIFA vice president, who has called for widespread reforms.