Ken Livingstone stated that rather than the design and build contracts being issued to preferred bidders, such as the Olympic Stadium, they would be selected through design competitions, as with the Aquatics Centre.
'Part of the problem follows what happened with Multiplex and Wembley; it has really discouraged contractors from bidding for these high profile projects.'
Meanwhile, London 2012 design director Alison Nimmo reaffirmed that a design competition for the third permanent venue, the Velopark, will still be going ahead.
An OJEU notice was supposed to be released in the beginning of January, but it has yet to be issued.
Nimmo said: 'We are still launching a design competition for the Velopark. The only reason it hasn't been released yet is because we want to make sure the brief is absolutely correct. We expect to issue the release later this month.'