The firms will now vie for high-profile work advising the ODA on the hosting of the London 2012 Olympic Games.
The firms were chosen from a shortlist of 15 by a panel headed by the ODA's interim finance director David Leather. The selection process was completed within a fortnight. The successful firms will advise on areas including procurement, contract negotiation, planning, infrastructure, transport, utilities and HR.
An ODA spokesperson told The Lawyer: "There have been no mandates awarded yet. There are no specific areas any of the firms will advise on."
ODA head of procurement Morag Stuart said: "The firms have a cross-section of expertise and it is this breadth of experience that will be invaluable to the ODA."
Meanwhile, the ODA continues its search for a permanent general counsel, with an appointment expected in September. DLA Piper Manchester projects partner Peter Rout is currently filling the role on secondment.