The 2012 Olympics could bring in up to £2bn from visitors to London, according to the Games' organisers.
Keith Mills said London should maximise the opportunities
Keith Mills, deputy chairman of the London 2012 organising committee, told tourism chiefs hosts had seen a huge spin-off from Olympic-related visits.
Speaking at Visit London's annual general meeting, he said the Games would have a lasting positive effect on tourism in London and the UK.
But he said there should be a long-term strategy to maximise the benefits.
"The experience of other cities indicates that London's visitor economy could benefit from as much as £2bn as a result of the Games," Mr Mills said.
"It's vital that we maximise opportunities by working closely with Visit London, Visit Britain and the tourism industry throughout the UK.
"The Olympic Games in London will showcase the capital's people, places, cultures and capabilities to the world like never before."
He added: "Thoughtful planning and the careful building and nurturing of effective, mutually beneficial partnerships between public and private sector agencies, international partners, and the Olympic organisers will be needed to maximise this once-in-a-generation opportunity."