uk Athletics has missed its deadline to pick a stadium site in its bid for the World Athletics Championships in 2005.
The sport's governing body delivered its 100-page bid document to the International Amateur Athletics Federation in Monte Carlo on Monday without proposing a host arena for the games.
A working party made up of Sport England and the Department of Culture, Media and Sport now has until 2 April to choose a site or risk the bid going forward with nothing more than a government guarantee that a host stadium will be ready.
An official at uk Athletics confirmed that potential sites in London include Twickenham, White City, raf Northolt and Hackney Marshes. None of these are mentioned in the bid papers but they are under consideration by the taskforce, she said.
The failure to finalise plans for a stadium comes after the rfu had commissioned Sheffield architects Ward McHugh Associates to conduct a feasibility study into rebuilding the south stand at Twickenham and adding an athletics track.
The search for a new host stadium began in December when athletics was excluded from the redevelopment of Wembley by Foster & Partners.
Chief executive of uk Athletics, David Moorcroft, has said that track and field needs a separate 25,000-seat home to host grand prix events in addition to a larger stadium for World Championships.