No charges have been filed against Mr. Nuzman, and he has emphatically denied all accusations of wrongdoing.
Mr. Maleson, who piloted Brazilâs first bobsled team at the 2002 Winter Olympics in Salt Lake City, said he had spoken with the authorities in Brazil and France.
âI started speaking to the I.O.C. in 2011,â Mr. Maleson said in a telephone interview. âEvery year, we had scandals with the organizing committee and the Brazilian Olympic committee.â
Prosecutorsâ accusations against Rioâs bid and Mr. Nuzman are the latest graft claims involving the 2016 Games. Corruption inquiries that stretch far beyond the Olympics have led to the detaining of senior political and business leaders and the downfall of the former Brazilian president, Dilma Rousseff. SÃ©rgio Cabral, who was governor of Rio when it won its bid, has been sentenced to prison for 14 years after being convicted of receiving kickbacks from construction firms in return for awarding them lucrative contracts, including some linked to the Olympics.
In a statement, the I.O.C. confirmed that Mr. Maleson had contacted it and said he had been told to work âdirectly with the N.O.C. in order to resolve any potential dispute,â a reference to Brazilâs national Olympic committee. In other words, the I.O.C. told Mr. Maleson to address his grievances about Mr. Nuzman with the organization run by Mr. Nuzman.
The police said this week that Mr. Nuzman, an honorary member of the International Olympic Committee, had played a central role in Rioâs reported vote-buying efforts. They said he had connected a wealthy Brazilian businessman based in Miami, Arthur Soares, with Lamine Diack, who was in charge of the world governing body of track and field. One of Mr. Soaresâs companies then paid $2 million to Mr. Diack through a company owned by his son Papa Massata Diack, the authorities said. The elder Diack was arrested in France in 2015 after he was accused of covering up failed doping tests in return for cash. Authorities in France have said that his son would be arrested if he traveled to France.
A spokesman for the I.O.C., which will meet next week in Lima, Peru, said the organization did not have âthe capacity to make any criminal investigation. Therefore, if anyone brings to our attention alleged criminal activities, he/she will be advised to contact the relevant law enforcement authorities.â
Two years before the 2016 Summer Olympics in Rio, Brazil hosted the soccer World Cup, spending billions of dollars on projects linked to the two events. Corruption investigators are looking into at least half of the 12 stadiums used for the World Cup. JosÃ© Maria Marin, the head of Brazilâs soccer federation at the time of the event, faces trial in the United States on charges including money laundering and wire fraud. His predecessor and successor, who remain in Brazil, have also been indicted in the United States case, which exposed widespread corruption in global soccer.
Mr. Maleson said he thought investigators would uncover more evidence of wrongdoing as their work continues.
âI explained and gave them information about what I know in order for them to investigate,â he said, declining to reveal precise details. âThis is just the beginning â thereâs more things they already know.â