"We will assume that 80% [of main contractors' work] will go to their existing supply chains," said Stuart. "But through the website we will try to access those opportunities that would normally be lost."
The new website, competefor.com, is currently being trialled and will be officially launched in the New Year.
It is the result of joint working between the ODA, the London Organising Committee of the Games and regional development agencies. The website will allow specialist firms to advertise their services and Olympic contractors to post opportunities.
The ODA estimates that up to 50,000 contracts will be procured by its main contractors, with up to 10,000 of these made available through competefor.com.
A similar site, villagesupplychain.com, has been set up by athletes' village developer Lend Lease and its delivery partner, Bovis to help it build 4,000 homes on the neighbouring Stratford City site by the end of 2011.
Bovis Lend Lease head of procurement David McKay said the contractor was keen to expand its supply chain.
"The whole point of our website is to assess the capability of our existing supply chain and also expand it," said McKay. "If you look at the amount of construction we have over the next few years there is no question that we have to expand our supply chain."
At the nearby Stratford International station Australian retail developer Westfield, which is developing the retail area centred on Stratford International station has its own in-house construction teams but will also need to expand its list of suppliers.
But, Westfield commercial manager Andrew Fox said it was unlikely to be launching a website. "I think there are good ways of doing things and bad ways of doing things, and generally the more human ways of doing things are better," he said.