“I am now pleased to inform you that yesterday the Main Stadium Track has been fully installed,” Andrea Vallauri, head of Mondo’s Sport Division, told insidethegames today.

The news will come as a welcome relief to the Rio 2016 hosts, who have been in the media firing line in recent weeks and months over a series of construction delays, most recently concerning the Velodrome, at which the Test event has had to be postponed.

Mondo - an Italian company based in Gallo d’Alba - has been laying Olympic tracks since 1976 and recently extended a partnership begun in 1987 with the International Association of Athletics Federations on to 2024.

“We got so many comments back from athletes saying Beijing 2015 was one of the best tracks they had ever performed on,” Vallauri added.

“For Rio we have improved a little bit again from Beijing, where the climatic conditions are completely different.

 “We have adapted the same concept of Beijing to the Rio climatic conditions, which will be much hotter and more humid.

“We have used nano-technology to make molecular modifications to the formula of the track.

“Rio is a further evolution of our idea - it’s London, Moscow, Beijing, Rio.

"Rio is the ending of a natural evolution beginning in London.”

Work in the Estádio Olímpico João Havelange has been impacted by disruption to electricity and water supplies due to outstanding utility bills of $225,000 (£152,000/€207,000).

Problems were compounded by delays due to the Christmas and New Year holiday in Brazil, and severe weather conditions.

But now the track, which was originally due to have been completed by the end of March, awaits two more weeks of line painting and testing before the Ibero-American Championships are held on it.

A Paralympic Test event is due to take place a week later.

Constructed for the 2007 Pan-American Games and currently the home of Botafogo Football Club, the Stadium has a capacity of 45,000 that is being temporarily increased to 60,000 for the Olympic and Paralympic Games, during which it will stage group-phase football matches and the athletics track and field competitions.

The Stadium was closed in March 2013 after officials discovered the roof was in danger of collapse and did not re-open until earlier this year.