FIFA general secretary Jerome Valcke admitted on Thursday that there was "no plan B" if Rio's emblematic Maracana stadium was not ready for June's Confederations Cup in Brazil.
The famous old stadium in Rio de Janeiro, that hosted the final match of the 1950 World Cup, has been undergoing a makeover.
There had been concern that reconstruction was falling behind schedule, particularly following heavy rains in the city on Tuesday night that left parts of the site flooded and forced a planned FIFA inspection on Wednesday to be shelved.
FIFA officials are due to meet with the local organising committee, the Rio government and constructors Odebrecht on Friday to discuss the issue.
"It will be a meeting to discuss every part of the stadium -- pitch, overlay, IT, TV, food and beverage -- so we can ensure ourselves that there is a clear understanding of what will be ready on April 27," said Valcke, before adding: "or if something will be missing."
The FIFA chief also added that "there is no plan B" in case the Maracana or any of the other five venues for the Confederations Cup are not ready.
"We've already sold tickets for the six stadiums -- there is no possibility to change this, there is no plan B," he told reporters.
O Globo newspaper published photos on Thursday showing that there was no grass on the Maracana pitch, which was flooded with water, thousands of seats had yet to be fitted in the stands and only a part of the roof had been built.
The local government claims that 87 percent of the rebuilding work has been completed and the stadium remains on course to host matches not just at the Confederations Cup in June but also the World Cup in 2014.
"It's true that the photo with water isn't perfect but this can happen, as long as the ready date is respected," added Valcke.
"We're holding to April 27, that's always been the date for us and nothing has changed.
"But as you see in the different stadiums inaugurated these last few weeks, there are always problems and that's why we need time between the inauguration day and the day the stadium will be used."
The official presentation of the Maracana to FIFA was supposed to take place in February but had to be postponed until May 24, some three weeks before the start of the Confederations Cup on June 15 when Brazil play Asian champions Japan in Brasilia.
The first match in the Maracana is due to be a friendly between Brazil and England on June 2 while the first Confederations Cup match to be held there will be on June 16 between Mexico and Italy.