It has emerged that Chuck Blazer was a chief informant for investigators for 18 months while on the Executive Committee (ExCo) of Fifa.
A detailed agreement which shows that the former Fifa official was secretly tipping off United States prosecutors from 2011 after pleading guilty to charges of bribery, money laundering and tax evasion has been revealed.
This secret deal, which was struck in November 2013- the day Blazer pleaded guilty-, have been made public by a judge upon a request by five media groups. Meanwhile, the 19-page co-operation references written pact between himself and the US government dating back to 29 December 2011.
“The defendant agrees to furnish to the office all documents and other materials that may be relevant to this investigation… And to participate in undercover activities pursuant to the specific instructions of law enforcement agents,” says the contract.
The 70-year-old American was on Fifa ExCo from 1097-2013.
In May, US prosecutors indicted 14 Fifa officials on charges of racketeering, fraud and money laundering involving more than $100m (£64.82m about N20bn) dating back to 1990s.
A report by the New York Times last year said Blazer had bugged meetings with ExCos at the London 2012 Olympics with wire device concealed in a key fob.
Blazer was general secretary of the North and Central American governing body Concacaf from 1990 to 2011.