Citigroup disclosed the subpoena in a regulatory filing late Friday, saying it is cooperating with investigators in the matter.
When they announced charges against high-level executives of FIFA, world soccer's governing body, last year, federal prosecutors had said several banks, including HSBC and JPMorgan Chase, were used to transfer cash.
JPMorgan has not disclosed any investigation.
In the filing, Citi said investors requested information on "banking relationships and transactions at Citibank and its affiliates associated with certain individuals and entities identified as having had involvement with the alleged corrupt conduct."