The announcement comes in response to the BBC's revelation that FIFA had received warnings, before the start of the competition, that the Super Eagles could be "vulnerable" to potential attempts to sway results.
The governing body have not denied being given such information, but stated that their own subsequent investigations have shown no evidence of any wrong-doing.
"FIFA and the Early Warning System (EWS) have a network of informants from which we receive information," read the statement
"Of course, as you may understand, we will not disclose the identity of the informants. What we can say is that at least until today no information provided by the informants to FIFA in relation to any potential match-fixing activities during the 2010 FIFA World Cup have proved to have any substance.
"Furthermore, we can also say that there is no indication whatsoever until today of any match-fixing situations during any of the matches of the 2010 FIFA World Cup."