Prince William will join England's bid team for the 2018 World Cup next week, Clarence House has said.
The Prince, president of the Football Association, will spend time privately meeting Fifa delegates and other leaders from the world of football.
He will attend England's presentation to host the event on Thursday morning in Zurich and Fifa's announcement of the winner on Thursday afternoon.
The Prince will be joined by the Prime Minister and other bid ambassadors, such as David Beckham and Gary Lineker.
The news came after Lord Coe, who is on the board of England 2018, urged the country's delegates to bombard the world governing body's executive committee with positive messages about the country's ability to host the event.
Lord Coe, who helped to bring the 2012 Olympic Games to London five years ago, spoke out to overcome any negative impact from a Panorama Fifa expose planned for Monday night.
The programme is expected to make allegations of corruption against people involved with Fifa, something unlikely to go down well with the organisation's members.
Lord Coe, 54, said: "You have to focus absolutely on the job at hand.
"(Outside) noises are not what is going to get you across the line. They're not going to stop you getting across the line.
"It is really a very important discipline in the process of a bid to just simply focus on the messages. You deliver those messages right to the moment where there is nowhere else to go and you maintain clear heads."