Sir Keith Mills, London 2012's deputy chairman, said the organising committee would be seeking sponsors in four key categories - automotive, banking, telecoms and utilities.
It is hoped at least two will be in place by the end of the year, reports the UK's Guardian newspaper.
Mills said that 35 per cent of the Games' £2billion running costs would be paid for by commercial sponsorship raised in Britain.
The remainder will come from ticket sales, merchandising and a share of the International Olympic Committee's broadcasting and sponsorship revenues.
The deals have to be complementary to the International Olympic Committee's official sponsors, who include Visa, Samsung, Kodak, Coca-Cola, Panasonic and McDonald's.
Mills revealed there would eventually be 10 first-tier sponsors; 20 to 30 in the second tier, which would be sought in 2007-08; and up to 50 in the third tier.
