Russian President Vladimir Putin says the United States is meddling in Fifa's affairs in an attempt to take the 2018 World Cup away from his country.
Mr Putin said in televised comments that it is "odd" that the probe was launched at the request of US officials for crimes which do not involve its citizens and did not happen in the United States.
In a separate probe, Swiss prosecutors are investigating the awarding of the 2018 World Cup to Russia and the 2022 tournament to Qatar.
Mr Putin described Wednesday's pre-dawn arrests of seven soccer officials in Zurich as "yet another evident attempt to derail Mr Blatter's re-election as Fifa president".
He said he is aware of "the pressure" on Mr Blatter for his support of Russia hosting the World Cup.