Former England 2018 World Cup chief Andy Anson has told FIFA's ethics investigator he wants more information about his probe into the bidding process before he will meet him.
Anson, who was England 2018's chief executive, has been contacted by Michael Garcia, a US attorney, who has asked to speak to officials from all nine nations which bid for the 2018 and 2022 tournaments and who is visiting London next week.
Anson will be unable to meet him then as he is out of the country, but he has also requested Garcia provide more details about the scope of his investigation.
He told Press Association Sport: "I have been contacted by Michael Garcia and I have asked for more information before agreeing to meet him.
"The letter did not specify anything about the scope, remit or objectives of the investigation. It just said there was an investigation but no detail on what it was about."
Garcia has also contacted the Football Association, which has indicated officials will meet him, and the former 2018 bid chairman Lord Triesman, who made a number of allegations about the bidding process to a Parliamentary committee in 2011.
Triesman claimed four FIFA members sought inducements of various kinds in return for backing England's failed 2018 World Cup bid. An initial probe by the world governing body said there was no evidence that had taken place, and three of four - Jack Warner, Nicolas Leoz and Ricardo Teixeira - have since left FIFA in disgrace for matters unconnected with World Cup bidding.
However, in the FA's subsequent review of Triesman's claims Anson had said there was no specific evidence against any of the FIFA members.
Garcia is due in London on October 9 and 10.
His review may run into problems however - the 2018 bid was won by Russia and in April the attorney was one of 18 people named on a list of Americans barred from entering Russia over what Moscow said were human rights abuses.