Antonio Abete adds he's 100% confident everything will go ahead as planned.
At a time of economic crisis in Brazil, they're doing it on a strict budget.
But his team are promising a spectacle that will be bigger and better than London 2012, which cost $40m (£31m), and was directed by Danny Boyle.
Mr Abete works for Filmmaster Events, and is answerable to the International Olympic Committee for delivering a show that will be watched by a global audience of around three billion people.
"The budget is completely different. We cannot say the real numbers, firstly because we are not allowed, but secondly because it's really difficult to know what the real number is.
"It's much less than London. It's because in Brazil everyone knows what the situation is, economically and politically. It's correct to invest money in the opening ceremony, but I think it's also correct to invest the right money.
"We are completely confident we can create an amazing show, without spending the huge amounts that the previous Olympic ceremonies had.