Marco Polo del Nero has remained president of the Brazilian Football Confederation despite being among the officials indicted last year as part of an American investigation into soccer corruption.
Del Nero also remains free to hold positions of power in soccer, although FIFA's ethics division has now announced it has been investigating the former executive committee member since December.
"We are able to confirm that there are formal proceedings going on against Marco Polo del Nero," the investigatory chamber of FIFA's ethics committee told The Associated Press.
Brazil has a long history of not extraditing its own citizens to other nations. Del Nero has avoided traveling outside Brazil since being indicted, so he has missed the FIFA presidential election in Zurich in February and Infantino's first congress in Mexico in May.
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But on a trip to the Olympics in Rio de Janeiro last week, Infantino was filmed alongside the accused official at the headquarters of Del Nero's CBF, an awkward image for a FIFA president pledging to clean up world soccer after the tarnished era of his predecessor, Sepp Blatter.
Del Nero initially took a three-month leave of absence from the CBF presidency after being indicted in December, but he resumed the job in April. Brazil's national senate is also conducting a corruption investigation against Del Nero led by former Brazil and Barcelona star Romario, who is now a national senator.