Sepp Blatter says Fifa "totally" trusts Brazil will have stadiums and infrastructure ready for the 2014 World Cup.
The Fifa president told reporters after a World Cup organising committee meeting: "Don't be afraid."
Brazil has delivered just two of six stadiums for the Confederations Cup tournament in June. The iconic Maracana in Rio de Janeiro has an April 27 completion deadline.
Blatter says "it's all a question of trust and confidence," and Fifa has faith in Brazilian authorities.
The Fifa president adds Brazil "will be ready because it is the World Cup and no one can afford not to be ready for the World Cup."
Brazil sports minister Aldo Rebelo says he will join Blatter in touring the 12 World Cup host cities during his visit for the two-week Confederations Cup.