Blatter met with Brazilian President Dilma Rousseff in a ceremony in the capital Brasilia, where he handed over the World Cup trophy ahead of the tournament that starts next week. He spoke only briefly, wishing Brazil well, and did not take questions.
"This is a historical, emotional moment passing on the cup of cups from the hands of the last champions to the president of Brazil," Blatter said, speaking a mix of Spanish and Portuguese.
The Sunday Times newspaper in Britain reported it has obtained millions of documents detailing irregular payments to football officials from a former member of FIFA's executive committee, Mohamed Bin Hammam of Qatar.
Rousseff, speaking in the presidential palace, hinted at possible protests during the World Cup but said visitors would get a warm welcome.
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"We are a democratic country," Rousseff said. "A country that respects freedom of protest, and freedom of expression. ... To foreigners who plan to visit, we wish them - in the name of all Brazilians - a warm welcome. You're going to find a transformed Brazil."
Four are expected to become white elephants after the World Cup.
"In the next six weeks we will continue to work a lot so the World Cup 2014 will be the cup of cups," said Rousseff, who is up for re-election in October.