Both men are understood to have helped FBI build case against his father and other senior soccer officials from governing body FIFA

Court papers were kept secret until now and Daryan and his brother Darryl, who also plead guilty to a mortgage scam still face jail

Guilty: Daryan Wartner admitted making 'substantial profit' as he scalped World Cup tickets in Germany and South Africa

The son of disgraced former soccer boss Jack Warner has described his role in a multi-million dollar World Cup ticket scam, buying up seats and selling them at inflated prices, in court documents unsealed today.

Daryan Warner's guilty plea to a string of charges is set out in a 2013 agreement with US prosecutors to provide evidence of FIFA wrongdoing.

His brother, Daryll, also made a plea deal after being accused of mortgage fraud.

And the documents suggest the US Department of Justice is investigating fraudulent ticket sales dating all the way back to 1994, when the World Cup was held in the United States for the first time.

The probe has highlighted what many have long believed, that FIFA is riddled with corruption that has blighted soccer for years.

This week Sepp Blatter, the governing body's president, announced his resignation.

One of the earliest signs of the impending storm came at a closed hearing in October 2013, when Daryan Warner, then 45, set out his guilty plea.

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Father and son: Jack Warner (left) with his son Daryan, who is now facing the possibility of a jail term after details of his guilty plea to a ticket scam was revealed. He has co-operated with the FBI in its soccer corruptino probe

Rogues' gallery: Interpol has put jack Warner and five other former FIFA on its most wanted list, issuing international arrest warrants for two former FIFA officials and four executives on charges including racketeering and corruption

'In 2006, I purchased the tickets directly from FIFA, and I misled FIFA to believe that my partner in reselling the tickets was not involved in the transaction, because I believe that FIFA would not have sold them to me had he been involved,' he said.

'In 2010, I purchased tickets from others, in order to mislead FIFA to believe that I was not receiving tickets, because I believed that FIFA would no longer sell tickets directly to me.'

He also described how he had deposited cash at banks in New York in lump sums of less than $10,000 because he knew anything larger would be reported to the authorities.

In a five month period, he said he deposited more than $100,000.As part of his guilty plea, he agreed to pay almost $1.2m that he made from the ticket sales and to provide evidence of bribery and fraud.

His brother, Darryl, pleaded guilty to making a fraudulent mortgage application and wire fraud.The deals were crucial to the Department of Justice Investigation.

Darryl admitted trying to buy a condo in Miama for himself, his father and his brother fraudulently.

Just like the arrangement with Chuck Blazer, it allowed investigators to chase corruption into more senior levels of Fifa.

Their father, Jack Warner, has been charged over alleged corruption at Fifa.

He has been arrested and bailed in his native Trinidad, and made a defiant TV broadcast on Wednesday night claiming he has an 'avalanche' of evidence he will reveal.

Ex-FIFA vice president Jack Warner holds a copy of a check as he claims to reveal an 'avalanche' of secrets. His sons are understood to have co-operated with the FBI in building a case against their father

Scammed: Daryll Warner admitted a mortgage fraud to buy this Miami condo. He told the federal court in Brooklyn that he knew he would have been turned down for a mortgage and engaged in fraud

Jack Warner quit his position in FIFA and as head of the Confederation of North, Central American and Caribbean Association Football (CONCACAF, which was more widely known by its acronym) in the wake of bribery allegations in 2011.

The investigation ended with his resignation. The hearings were conducted in a closed court and the transcripts sealed until now to allow the investigation to continue in secret, unknown to Fifa's higher echelons.

Despite there were light moments even as serious crimes were being examined.

At one point, Daryan Warner struggled to read a statement setting out his crimes prompting Judge William Kuntz to intervene.

'Take your time,' he said. 'Take a drink of water. Slowly and loudly. Channel your inner Lord Vader, not your inner Woody Allen, okay? That's what I say all the time.'

His brother's guilty plea concerned the purchase of a $1m condo in Miami. He told the federal judge that he knew he would have been turned down for a mortgage and made false statements.

He also admitted making a series of deposits of less than $10,000 in banks with the intention of dodging federal reporting rules which notify the Internal Revenue Service of any deposits greater than $10,000, and deposited more than $100,000 in six months from July to December 2011.

Both men are yet to be sentenced. Daryll, who is a US citizen, faces a maximum sentence of 20 years, although it is likely to be significantly less because of his cooperation with the federal authorities.