West Ham could find a new home in London's Olympic Stadium after organisers changed their mind about a football club using the facility.
Lord Coe inspects the work on London's Olympic Park
Officials had insisted that after the 2012 London Games the East End stadium will be reduced in capacity and used for athletics.
But organising committee Chairman Lord Coe confirmed it could also house a Premiership team, such as West Ham.
"No doors are open and no doors are closed," he said.
Lord Coe was speaking on the first day of a visit by the International Olympic Committee to inspect London's preparations for the Games.
"We have never ruled out a Premiership, club but we have always made it very clear that a legacy for track and field is a serious part of the Olympics in London," he said.
"We want to bring major events to this country and how we settle on a legacy for this stadium is under review at the moment."
Asked if the stadium could accommodate a football pitch with an athletics track running around the outside, Coe admitted: "It's certainly possible, but again all these discussions are currently taking place.
"At this moment we have moved from the laboratory conditions of our bid document into a living, breathing creature and all these issues are currently being scoped out."
Only last month, London mayor Ken Livingstone ruled out any possibility of West Ham moving into the stadium, saying the IOC would not allow London to change the pledges of their bid document.