Football's world governing body FIFA has confirmed that three of the stadia to be used at next year's World Cup in Brazil will not be finished by the original deadline.

The venues in question are now expected to be ready in late January or early February instead of this month.

The stadiums in question are in Sao Paulo, Curitiba and Cuiaba. 

FIFA's secretary general Jerome Valcke says he is not concerned about the construction delays.

Last week, two workers were killed when a crane collapsed at a World Cup venue in Sao Paolo.