The ODA has set up a portal, www.competefor.com, on which main contractors are contractually obliged to put their subcontracts if they don't have an existing supply chain.
"[Main stadium contractor] Sir Robert McAlpine has put five opportunities on the system," said ODA head of procurement Morag Stuart, speaking at NCE's Games Briefing conference on Wednesday.
"Yesterday Skanska put theirs on. Bovis Lend Lease will put theirs on. I think Skanska has another five to post next week."
The ODA has 250 major contracts above £20M to award by 2009 and see the website as good way to opening up access to small businesses and a diverse supply chain.
"If you’re a big established contractor like Sir Robert McAlpine, you'll come with a degree of suppliers and we don't want to break up a chain that works," said Stuart.
"You'll probably have 70-80% of suppliers already identified. We're trying to capture that 20% which might go to google search or recommendation."
Suppliers need to register on the website; a process which should take about an hour. Then the data provided for the registration automatically gets submitted if you apply for an opportunity on the website.
According to Stuart 10000 suppliers have already registered and buyers are now starting to come online.
"The feedback we’re getting is typically 10-50 people are applying for each opportunity," said Stuart.
The ODA intends for the system to be rolled out for public procurement spend by Transport for London, London Development Agency and London borough councils in the future.