Benedicto Barbosa da Silva Junior, the chief executive of Obebrecht, has expressed his confidence that the wide variety of construction projects required as part of Brazil's sporting double header of the 2014 World Cup and 2016 Olympics will be completed on time.

The Brazilian conglomerate is one of the key players behind the construction plans for the two events, with contracts currently in place to build four football stadiums, the all-new Olympic Park and athletes village along with several other Rio-based projects.

An estimated $500 billion is set to be invested in improving the regions highways and enhancing the current infrastructure system in place in the South American region.

Brazilian Sports Construction Glory

But while the pressure to deliver at the Olympic Games may be fierce following the resounding success of London 2012, Junior remains wholly confident of delivering on projects related to the games, which will be mostly confined to Rio de Janeiro and easier to manage.

"The projects at the heart of the Olympics are in motion," he told Eurosport this week. "I have no doubt that everything will be ready on time ... If you drive around the Olympic areas today, you'll see progress." However, ask him about progress towards World Cup 2014 - some two years before the Games - and the response is markedly different.

"Today, I'm more worried about the World Cup than I am about the Olympics," he tells the news provider, ominously. Indeed, the scale of the football festival is perhaps the most challenging aspect, with the tournament spread across 12 cities in Brazil - making improvements and construction work a logistical headache.

Matters were hardly improved when FIFA official Jerome Valcke told reporters that the organsiers of the event required a "kick up the backside" to get work moving, back in March. The list of issues related to Odebrecht's World Cup-related projects makes for concerning reading too.

Brazilian Olymic Construction

In Sao Paulo, for instance, the firm is still trying to close a financing deal for a new stadium - despite construction having already started. Rennovation work on the Maracana stadium in Rio has also proven complicated, with much of the ground now set to be demolished.

Meanwhile, plans for stadiums in cities like Recife and Salvador could involve even more work, with much of the city's infrastructure in desperate need of an update.

The time frame for delivery of many of these stadiums is shortened too, with the venues expected to host the World Cup warm up tournament the Confederations Cup, next year.

Despite this Junior remains adamant plans will run smoothly, noting that city,state and federal governments have ensured detailed planning and costings were put together prior to construction.

"Previously in Brazil, (companies) would have started the project and said, 'OK, later we'll see what it costs.' Today, the government wants to have some security that the numbers will come in within a margin of error that's acceptable for everybody," he said. "They'll all be ready on time."