England and other European bidders Russia, Spain-Portugal and Belgium-Netherlands are still vying for both events as a formality.
The United States is the only non-European country still contesting both editions, after Australia, Japan, Qatar and South Korea focused their resources on 2022.
The Americans have said they will withdraw from 2018 bidding only if asked to by FIFA or UEFA president Michel Platini.
England to withdraw 2022 World Cup bid and focus on 2018
The Canadian Press
September 28, 2010