The Football Association says it has not found any evidence of England fans chanting an allegedly racist song aimed at Rio and Anton Ferdinand last week in San Marino.
But the FA insists they are taking the matter seriously and will take action if evidence of racist chanting is uncovered.
Rio Ferdinand was targeted for abuse by England supporters after he controversially pulled out of the squad for the World Cup qualifiers so he could stick to a pre-planned training schedule.
And, according to reports, one group of fans joined in with a song that suggested Ferdinand and his brother Anton, also a professional footballer, should be burned on a bonfire.
Anti-racism group FARE has made a complaint to FIFA over the song, which it claims could be perceived as having racial connotations.
The FA's Club England managing director Adrian Bevington said: "We have no reason to dispute the media reports, which are without doubt made for the right reasons of fighting racism.
"But, at this ti...