Joanna Averley, design director of the Olympic Delivery Authority (ODA), told the AJ that the OJEU process will be taken forward from August.
She said: 'We have a very critical design programme over the next 18 months.
'Procurement will begin in the latter half of the summer, and will be staggered to coincide with the different construction times of the different projects.
'Once we press the button we will have to move fast.'
The executive added that the 'next stage' for the ODA will be to move from masterplanning to individual venue design.
She continued: 'Another key waypoint is town planning - we may well have to put in another planning application.
'Aspects have changed, as we have retracted from some of the land.'
The seconded CABE official also suggested that London Mayor Ken Livingstone's architecture advisers Richard Rogers and Ricky Burdett may have a role in a design review panel at the ODA.
She said that work is under way to set up a joint design review panel at the ODA, which will report to both CABE and Livingstone's Architecture and Urbanism Unit.