Southgate said: "The most testing period has been the last couple of days".
The widespread optimism is a far cry from the reaction England received following their Euro 2016 exit, when the team and then-coach Roy Hodgson were criticised heavily for their underwhelming performance in the competition.
We might live in a time where sometimes it's easier to be negative than positive, or to divide than to unite, but England: let's keep this unity alive.
While Modric may be a worthy contender for Footballer of the Year, his team's quick switch in tactics during their World Cup semifinal against England shows that danger lurks around every corner playing against this Croatia squad. I think knockout football is about fine margins and when you have good spells against fine sides you need to take your chances.
"I think all of us deserve this".
Martinez switched nine players and Southgate brought in eight, a decision he described as a "no brainer" in the circumstances.
Germany, Brazil, Belgium, Portugal and Argentina currently occupy the top five slots in the rankings but Southgate said that the pressure is now on England to rise up to the very top.
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The American then cruised through the deciding set with a single break of serve enough to ensure her place in the semi-finals. She probably should have done her homework on Williams, who crushed the upset-minded Italian after dropping the first set.
"They've got to know the players a little bit better and realised the perception is different from the reality".
England were hoping to reach a first World Cup final since 1966, but let an early lead slip to lose 2-1.
Speaking at his pre-match press conference, Southgate said: "We have to decide who can go again physically". We will push them to play our game.
Ivan Rakitic has joked he will get a tattoo on his forehead if Croatia win the World Cup.
But the England side will be well-prepared for the contest, with its members regularly playing with or against the majority of the Belgium side in the Premier League. "There's a culture that exists now that when we come together, we expect every new player to follow".
"We felt the best way to be successful in this tournament was to play that system. If we have a parade that would have been in one part of the country and we represent the whole country".
Russian Federation qualified automatically for the World Cup finals as the host country and entered the tournament as the lowest-ranked team.