The two centres, which will sit next to each other on the east London site, will total 120,000m2 in size and will become the main employment spaces once the Games are over, becoming office spaces and studios for a variety of organisations.
An ODA spokesman, said: 'We want to be as open and transparent as possible, and we have already had expressions of interest for the international broadcast centre and the main press centre, but this is opening it up to everyone.
'We're leaving the OJEU notice quite broad, to allow for more varied responses. It's an enormous space, and Hackney Council is aiming to build a neighbourhood around it in Legacy mode.'
The two centres will be fitted out by the London Organising Committee for the Olympic Games (LOCOG) for all media requirements during the Olympics.
All expressions of interest should be made by 5 April, and invitations to participate will be sent out on 13 April.
Construction is scheduled to begin on 30 September, with final completion due on 31 March 2013.
For more information visit http://www.ted.europa.eu/ OJEU notice number 2007-58941-EN.