Brazil's antitrust body says several construction companies rigged their bids for 2014 World Cup stadiums, driving up costs by overcharging for the work.
"So far, there are indications that at least five bids related to World Cup stadiums were the subject of the cartel," the antitrust body CADE said in a statement.
Included in the five bids is Rio de Janeiro's famous Maracana, where Germany defeated Argentina 1-0 in the World Cup final.
Two other stadiums named on Monday in the statement were in the northeastern city of Recife, and in Belo Horizonte in the southeast.