Fifa secretary general Jerome Valcke says Brazil will have to be ready to hosts the 2014 FIFA World Cup.
The Frenchman paid a visit to the Arena da Baixada venue in Curitiba, where Nigeria will play its opening match against Iran on June 16, which is heavily behind schedule.
The stadium is just one of 12 several stadiums- set to host 32 nations and millions of fans- which still remain unfinished.
“Brazil has no choice. Brazil has to be ready,” said Valcke.
“In 2007 you [Brazil] asked the world to support you to organise the World Cup in 2014. You have to welcome 31 teams from around the world.
“Brazil has to welcome thousands of thousands of fans and 7,000 journalists coming from around the world. So, we have to work together.”
The World Cup starts on 12 June. Brazil and Croatia sets the ball rolling with their opening Group A match at the Arena Corinthians in Sao Paulo.
FIFA had earlier waved a December 2013 deadline date for the completion of the 2014 World Cup stadiums.
Two workers were killed at the Sao Paulo stadium venue in November when a crane fell and destroyed parts of the stadium last November.
Valcke said on inspection of the stadium where the opening ceremony has been slated for: “In a way I would say the pressure is a little bit bigger here. It’s the first game. It has to be a success. The world will be watching.
“We will do all that we can to make sure this opening game is a success.”