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Former France international Patrick Vieira has warned that "all the nations in Europe will suffer" at the World Cup because of the very high temperatures in Brazil.
However, he said England's pre-tournament games in Miami would be "a good preparation" for the humid conditions the team will face in Brazil.
Get the latest updates on the World Cup at ITV Sport.
Former Arsenal and England striker Ian Wright has said the emergence of several players can help take the pressure off Wayne Rooney at the World Cup.
Wright added that there were signs from Rooney's pre-tournament preparation that he is in "the right frame of mind" to produce a strong performance in Brazil.
Get the latest on the World Cup from ITV Sport.
Tottenham Hotspur defender Kyle Walker says he is "gutted" to miss out on a place in Roy Hodgson's World Cup squad as a result of a pelvic injury.
Roy Hodgson said England can win the World Cup in Brazil as he announced his 23-man squad for the tournament.
Asked whether England could triumph in South America, Hodgson said: "Yes of course we can win the World Cup, but why would we be going otherwise? We are right to have some degree of optimism."
"But they are empty words, I have never understood the importance people attach to that.
"If we are going to win it we will have to play very well, prepare very well and this talented group of players have to show their talent."
Roy Hodgson said England's young players have "imposed themselves" and deserve to be included in the World Cup squad.
The 66-year-old said players such as Luke Shaw, Ross Barkley and Raheem Sterling had played so well for their club teams that they warranted their selection.
Roy Hodgson said it was an "unbelievably hard" decision to leave Ashley Cole out of his World Cup squad.
The England manager chose to include Southampton's 18-year-old left back Luke Shaw instead of the experienced 33-year-old Chelsea player.
Cole subsequently announced his retirement from international football as he wished England success at the tournament.
"It was an unbelievably hard decision because Ashley is a player I and the rest of my staff really appreciate. I think he is a magnificent player and what he has done for England is second to none," Hodgson said.
The 66-year-old said he was grateful for Ashley Cole's acceptance of the decision.
Roy Hodgson says he hopes his 23-man England squad "will not let the country down in any way" at this summer's World Cup.
Manchester United midfielder Michael Carrick has said he is "disappointed" and "hurt" to be left out of England's World Cup squad.
England manager Roy Hodgson is set to name his 23-man squad for this summer's World Cup in Brazil.
Watch the announcement live below:
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These maps show the spread of birthplaces of England's last three World Cup squads.
The Three Lions boss has largely rewarded Premier League form in a youthful-looking squad for the tournament in Brazil. See the full squad: