He is due to address Britain's National Olympic Committee, which is made up of representatives from each of the Olympic sports, at its headquarters in Charlotte Street, London, where he will outline skeleton plans of his ideas.

Robertson exclusively told insidethegames: "When I was in opposition I felt the construction [of the facilities] was going extraordinarily well.

"For all the fact that the big challenges for the organising committee have in front of them they have made extraordinarily good progress, raising just over £600 million ($869 million) in sponsorship.

"But I felt the two stress points - the two things that were going to need the attention of an incoming Government - were security and legacy.

"From what I have seen nothing has changed that view."

Robertson will concentrate on the legacy issue in his first major speech since being appointed by new Prime Minister David Cameron last month to replace Tessa Jowell as Olympics Minister and Gerry Sutcliffe as Sports Minister.

He told insidethegames: "I think the lack of a coherent sports legacy is the single biggest challenge facing me as the combined Sports/Olympics Minister.

"In my speech I will lay out the framework by which we are gong to deliver this Olympic legacy.

"We then hope to have the plans in place for the two years to go mark at the end of July.

"I hope that by that stage everybody will know exactly how we are going to define a sports legacy from the Games.

"I'm not after revolution - I'm after sensible and achievable.

"At the end of my time as Sports Minister I want to be judged by whether I have extended the opportunities that are available through sport - massive as they are - to the maximum amount of people.

"It would be brilliant to win the 2018 World Cup [bid] and we've got to deliver a successful Olympics but actually getting more people involved in sport is the real key thing for me.

"What I want to do is produce a sports legacy plan that directly delivers that objective.

"That will need to have a community element, it will need to have a schools element primarily.

"They are the plans we are working on at the moment and they will be the plans that we will produce at the end of the year.

"If you follow what we have been saying about sport for the past five years since I've been shadowing the brief you are not going to find anything in there that will completely surprise you.

"It has to be sensible and it has to be deliverable."

Robertson will give Sport England a leading role in delivering his legacy proposals despite a National Audit Office report last month which criticised them for lack of transparency and that they failed to keep track properly of how £600 million ($869 million) of public money was spent on trying to meet the Labour Government target of getting a million more people involved in sport by the time of the London 2012 Olympics.

Robertson said: "I think Sport England prior to the arrival of the current management team was a mess.

"It had been far too politicised for far too long.

"When I took over as the opposition sports spokesman in 2005 I was not even allowed through the front door of Sport England.

"There has been a series of investigations that pointed to the fact it was not well run.

"In fact, you could tell it was not well run because, if you look at the participation figures in this country over the first decade of Lottery funding, they barely budged at all."

But Robertson believes the chairman Richard Lewis and chief executive Jennie Price will be able to help deliver his vision.

He said: "I do have confidence in the current management."

Contact the writer of this story at [email protected]