Carmody Groarke, Nord, Surface, Project Orange and Brisac Gonzalez have joined with JMP in a bid to win the competition to design the British Pavilion at the 2010 extravaganza.
The team - called 'Eight' after the number of partners in the project - will go head to head with Zaha Hadid, Marks Barfield, Avery Associates, Draw Architects and Heatherwick Studio entries to bag the Foreign and Commonwealth Office-run competition, entries for which must be in by Friday.
Cassius Taylor-Smith of architecture marketing group Wordsearch said McAslan had selected the firms because they both 'knew and respected' them.
'It has actually been a very easy process. Each firm has different architectural concerns; they are all very talented and all have different social, textural and material agendas.
The firms have not been pigeonholed - they have all brought different elements to the project,' added Taylor-Smith.
The £10 million pavilion - part of the World Expo's overarching theme of 'Better City, Better Life' - will have to handle up to 40,000 visitors a day over six months.
It will showcase Britain's culture, sport, media, education and business, as well as highlighting and promoting policies and technologies in low-carbon urban developments.