Two design groups are to be selected to work up plans for the redevelopment of the Olympic site after the 2012 Games.

It is understood that the London Development Agency (LDA) will next week announce that a consortium led by US urban design group EDAW is to team up with Dutch masterplanner Kees Christiaanse Architects and Planners.

The two groups will start to draw up the legacy masterplan that will be used as the basis for an outline planning application to be submitted in 2009.

This application will form the basis of the redevelopment of the Olympic park after the Games.

EDAW drew up the original Olympic legacy plan, which was approved by planners before the UK won the bid.

The selection comes amid controversy over the amount of affordable housing to be included in the development. Last week a senior adviser to the mayor suggested that to retain the value of the land, the amount of affordable housing could fall below the 50% promised.

It is understood that the LDA asked the two consortiums before Christmas if they could work together.

Postscript

The LDA declined to comment.