Accusations of massive fraud at the heart of football since the arrest of seven FIFA officials in Zurich last week places the firm controlling the embattled organisation's finances, accountancy giants KPMG, under scrutiny.
"If the auditors can't spot millions of euros going astray, what can they do?" asked Prem Sikka, professor at the UK's Essex University Business School.
"The FIFA scandal clearly shows that there's been a weakness in the control of the federation," Sikka said.
"If there is nothing to hide, please show us your files," the accounting expert said.
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Sikka believes the scale of the scandal calls for the European Union to get involved.
"The EU must act to force FIFA to open up the files."
Sikka's unease at KPMG's handling of FIFA's finances was echoed by another expert, Christophe Lepetit, a sports economist at the Centre of the Law and Economics of Sport (CDES) attached to Limoges University in southwestern France.
"They are a well-established firm with a serious reputation, but in light of the growing revelations we have the right to ask questions," Lepetit said of KPMG's role.
According to Lepetit the firm "had to judge the sincerity of FIFA's accounts, but perhaps they didn't want to go any further, believing that wasn't their mission".
KPMG, contacted by AFP, said it could not elaborate on its functions with football's ruling authority.
"As FIFA's statutory auditor we are bound to secrecy and must refrain from making any comment," the firm said.
Emile Carr of NGO Transparency International questioned how KPMG could have failed to pick up on any warning signs.
"Auditors carry out their work on a random or statistical sampling basis. Auditors do not carry out a one hundred percent test...."
"But where done properly (they) must have come across a few over the years," he added.