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.
More top news
Dramatic footage captures the moment a three-storey building collapses in a matter of seconds having been hit by flood water.
Isaam Abuanza is the first practising NHS doctor known to have joined the so-called Islamic State in Syria.
Hundreds of steelworkers will march on Wednesday to highlight the crisis in their industry.