Swiss prosecutors said on Friday they had opened a criminal investigation into Blatter on suspicion of criminal mismanagement and misappropriation of funds. Authorities interrogated Blatter at FIFA headquarters and seized unspecified data from his office.
The prosecutors said Blatter was suspected of a "disloyal payment" of 2 million Swiss francs (£1.3 million) to Platini in 2011 at the expense of FIFA, said to have been for work performed between January 1999 and June 2002.
Blatter told Swiss authorities on Friday that Platini "had a valuable employment relationship with FIFA" as an adviser, Blatter's personal lawyers said.
"He explained to the prosecutors that the payments were valid compensation and nothing more and were properly accounted for within FIFA including the withholding of Social Security contributions," the lawyers said.
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Platini made his own defence of the payments on Monday. The onetime football star for France said in a statement that he had not been accused of wrongdoing and that the money was fully declared to authorities in accordance with Swiss law. Platini offered to help FIFA's Ethics Committee to resolve any issues over the payment.
Blatter has said he plans to resign the presidency after an election in February.
He is also being investigated by U.S. prosecutors and the FBI as part of a sweeping probe into allegations of corruption in the world's most popular sport.
(Reporting by David Ingram in New York; Editing by Grant McCool)
