Wednesday 17 June 2015 11:40, UK
Swiss officials are probing 53 possible money-laundering incidents as part of their investigation into the bids for the 2018 and 2022 FIFA World Cups.
Michael Lauber, the Swiss Attorney General, revealed "suspicious banking relations" had been uncovered but any investigation could take years, such is the volume of computer data to be examined.
Lauber said he "does not exclude" interviewing FIFA president Sepp Blatter or secretary general Jerome Valcke as part of the investigation.
Addressing the media for the first time since the Swiss investigation into the game's governing body was announced three weeks ago, Lauber said the case is "huge and complex."
The probe follows the report by FIFA's ethics investigator Michael Garcia being passed to the attorney general into the bidding processes for the next two World Cups, due to be hosted by Russia and Qatar respectively.
"There will be formal interviews of all relevant people,” added Lauber. “By definition, this does not exclude interviewing the president of FIFA and/or its secretary general.
"Our investigation is of great complexity and quite substantial. The OAG has seized around nine terabytes of data.
"You find in the task-force specialised and experienced prosecutors, experts in mutual legal assistance and a specialized forensic IT team from the Federal Criminal Police.
"We note positively that banks in Switzerland did fulfil their duties to file suspicious activity reports. Partly in addition to the 104 banking relations already known to the authorities, banks announced 53 suspicious banking relations via the anti-money-laundering framework of Switzerland.
"The procedure is huge and complex on many levels."
Lauber said the investigation was separate from the FBI's football corruption probe which saw seven FIFA officials arrested in Zurich last month and which has indicted 18 people.
He added: "The Swiss investigations are executed independently from the prosecutions of our US colleagues. Therefore, documents and data of our Swiss investigation will not be shared automatically with the US counterpart. The exchange of information has to respect the binding rules of mutual legal assistance."
Lauber refused to give a time-scale but said it could take years to complete the investigation.
He said: "The world of football needs to be patient. By its nature, this investigation will take more than the legendary 90 minutes. Be assured - the OAG will give priority to this case and will act according to the principles of the rule of law."
