Michael Garcia, an American attorney who is FIFA's chief investigator, is examining claims of wrongdoing in the process and has spoken to the 12 members involved in the decision who are still members of the Executive Committee.

They are currently gathered in Zurich for a two-day meeting. 

UEFA and Confederation of African Football Presidents Michel Platini and Issa Hayatou are also among those to have been interviewed. 

Blatter and Hayatou are also both members of the International Olympic Committee. 

Other members who took part in the vote, which was held in Zurich in December 2010, have retired, while others have either been banned or resigned after being found guilty of breaching FIFA's ethics code. 

FIFA's decision to award Qatar the 2022 World Cup has been overshadowed by widespread allegations of corruption ©Getty Images

These include former FIFA vice-presidents, Qatar's Mohammed Bin Hammam and Trinidad and Tobago's Jack Warner, who were this week again linked to secret deals designed to ensure Qatar beat rivals Australia, Japan, South Korea and the United States.

Bin Hamman was banned from football for life in 2011 while Warner resigned the same year. 

It means both are now out of the reach of Garcia, who has no powers to interview them. 

Last September, Garcia said his probe into the bidding process for the 2018 and 2022 World Cups would see investigators interview representatives of every bid team.

Interviews have already taken place with several members of the unsuccessful bid teams, who include England and the joint Belgium-Netherlands bid. 

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