"If one candidate applies, the chances will be better than two, even if there is strong competition from Germany, England and Brazil," he said.
South Africa and Morocco are the only two African countries still promoting their bids. Egypt, Ghana and Nigeria have pulled out, Nigeria last month declaring support for South Africa.
Blatter, who has said the event should go to an African country if it can meet the ruling body's strict criteria on infrastructure, telecommunications and transport, was in Cairo for a meeting of the Confederation of African Football (CAF).
CAF President Issa Hayatou received the Moroccan and South African bids on Sunday but did not endorse either.
"All I can say is we have realistic ambitions of holding the World Cup in 2006 in Africa," he said.
All bids have to be with FIFA by the end of July. The decision on where the finals will be held in 2006 will be taken by FIFA's 24-man executive committee in March next year.
Reuters
