FIFA President Sepp Blatter says the World Cup will be "well done," but he criticised Brazilian authorities for starting late on stadium projects and for not providing enough worker safety.
Blatter spoke on Thursday in the Costa Rican capital, where he was attending the Under-17 Women's World Cup.
Three World Cup stadiums are still being built in the southern cities of Sao Paulo and Curitiba, and the western city of Cuiaba.
A fourth stadium, already opened in Porto Alegre, has been slowed in a dispute about how to pay for temporary facilities for television, hospitality and security.
The World Cup starts in 10 weeks.