London 2012 chairman Lord Coe is due to heap praise on the Labour Party for bringing the Olympics and Paralympics to Britain.
The former Conservative MP will commend key figures involved in securing the Games, including former prime minister Tony Blair and ex-culture secretary Tessa Jowell, for their "foresight and energy".
Lord Coe will urge politicians from across the spectrum to work together to create a successful Olympic legacy.
Appearing on the platform at Labour's annual conference in Manchester, he will say: "I am delighted to be at the Labour Party conference to put on record my personal thanks to Tessa Jowell, Tony Blair, Ken Livingstone, Richard Caborn and countless others that have made the Olympic and Paralympic Games the success they were.
"Their foresight and energy in supporting and driving forward the bid and the infrastructure budget was unparalleled. I also want to thank them for ensuring that cross-party support has flourished throughout years of preparations and the Games themselves.
"This has been vital in securing the benefits the Games has delivered so far - a regenerated east London, a Torch Relay and Cultural Festival that engaged every corner of the nation, a Games Maker volunteer force that has been heralded the world over and - above all - spectacular sport and athletes that have inspired young and old alike."
The "celebratory" conference session will be hosted by former triple jump Olympic champion Jonathan Edwards.
Dame Tessa, who was instrumental in securing and delivering the Games while in government and continued to play a key role in opposition, will use the event to attack coalition school sport policy. She will say: "When we won the right to host the Games we made a promise, that the 2012 Games would inspire a generation.
"Until the election this was happening in schools across our country. The dismantling by this Education Secretary (Michael Gove) of a world-class organisation for PE and sport in schools is beyond belief.
"So, in order that we keep our promise, I have invited the Government to work beyond party to develop the facilities, coaching and curriculum space so that we keep our Olympic promise to young people across our country. Building the next generation of Olympic champions starts with that - a plan for sport at every level."