US Fifa executive committee member Chuck Blazer, who will be on the 24-man group deciding the hosts for the tournaments, said: "For the 2010 bid, the executive committee at that time decided we would not accept joint bids after the experience of 2002, which manifested itself as a much more difficult logistical situation with two countries.
"As things stand in regard to bidding, if there are an adequate number of single bids we do not accept joint bids.
"If we are going to do anything different it will have to be addressed at our next meeting in March."
Fifa have said that a country will not be considered for 2022 if their continent is hosting 2018.
Any successful host will need to have at least 12 stadiums with minimum capacities of 40,000, and the final must be held in a stadium with a capacity of at least 80,000.
Countries and joint applicants are also barred from bidding to stage the event if they are located in a continent that has hosted one of the two previous tournaments.
A decision will be made on both World Cups in December 2010.
England bid chief executive Andy Anson said: "We believe we have a very strong case to bring the tournament to England."
In 2007 Fifa ended its policy of rotating the World Cup from continent to continent.
With South Africa hosting the 2010 competition, African nations will not be able to bid for the 2018 World Cup.
And South American countries will not be considered for either 2018 or 2022 as Brazil is hosting the 2014 World Cup.
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