FIFA said it is waiting to find out the extent of the damage caused by an accident at a Brazilian stadium before deciding whether the venue will be ready for the 2014 World Cup.
Two workers were killed yesterday at Sao Paulo's Corinthians Arena, which is due to host the opening match of next summer's tournament.
"It is too premature to make any detailed assessment on the situation of the Corinthians Arena as we are still awaiting the technical report to be able to evaluate the scale of the damage," FIFA said in a statement sent to The Associated Press.
"We will be able to provide an update earliest next week."
Part of the stadium was destroyed when a crane crashed into a 500-ton metal structure that toppled onto the venue's east stand.
A statement on the website of Corinthians, the Brazilian club due to occupy the Itaquerao Stadium in Sao Paulo, said the number of workers killed was two, rather than the three initially reported.
The stadium in Sao Paolo is due to seat nearly 70,000 people for the World Cup opening match on 12th June.
The venue is scheduled to host other five matches, including a semi final.
Images from Brazilian television showed part of the fallen crane, seen in yellow, underneath the metal structure which had buckled and collapsed onto a section of the stand at the stadium in Sao Paulo.
FIFA president Sepp Blatter said:
FIFA secretary-general Jerome Valcke said he was "extremely shocked" by the news of a fatal stadium collapse in Sao Paulo.
Firefighter spokesman Mauro Lopes told Brazilian radio that the accident happened when a crane collapsed on top of a metal structure above the east stand at the Sao Paulo stadium, the Associated Press reported.
Brazilian club Corinthians, who will occupy the Sao Paulo stadium upon completion, issued the following short statement on their website:
The Itaquerao stadium, due to host the opening match of the 2014 World Cup, was 94% completed at the time of the accident.
The damage could delay the completion of the stadium, which must meet FIFA's December deadline.
Three people were killed after a construction accident at the Itaquerao Stadium in Brazil, due to host the opening match of the 2014 World Cup, the Associated Press reported.