"All of that work is great but you really have to achieve at senior level for all of that to be fulfilled and we've got a great opportunity now to reach the final".
England face Croatia in Moscow on Wednesday after reaching the last four of a major tournament for the first time since Euro '96, when Southgate himself missed a penalty in a shootout defeat against Germany.
"This is already big, but we can do more".
"They have a lot of quality, they play well, well organised and a physically strong, but we are also aware of our quality".
Speaking at a press conference, the Manchester United wing-back said: "We haven't wont anything yet so there's no point celebrating".
"I wasn't a renowned fashion icon throughout my playing career [so] it's rather odd to feel that way now", said Southgate, England's latest style guru.
But on Monday, defender Ashley Young was quick to dismiss it's significance. We go 1-0 down, in danger of going home. Not what's happened in the past.
Southgate has been just the voice of reason England have needed to prevent anyone from getting too carried away. "I'm certain our team will play well and I have complete trust they'll go and play in the way they have throughout this tournament".
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So impressive in the centre of the park for Croatia has Modric been, that he is now one of the favourites to win the Golden Ball, but the experienced midfielder insists he is only focused on his teams success.
The two sides have met seven times in the past with England winning their last two clashes. The Three Lions are confident, and why shouldn't they be?
- England has not beaten two European nations in a single World Cup since 1982, when it beat Czechoslovakia and France.
Can Southgate now become the first manager to win a World Cup semi-final with England on foreign soil as he bids ultimately to match the achievement of Alf Ramsey's side? They are unbeaten so far in the tournament. Many supporters are viewing this match as England's chance of revenge.
Kane, who tops the Golden Boot standings in Russian Federation, had already scored and assisted as Spurs recorded a 4-1 victory in October.
England's 11 goals so far are equal to the country's record of most goals at a single World Cup set back in 1966, when they won the title.
Croatia survived two penalty shootouts against Denmark and host Russian Federation to reach the semifinals, the first time it has been at this stage since the famous team of 1998 finished third in France.
Croatia have shipped four goals in their last three matches, with Lovren playing a full part in two of those and coming on as a sub in the other.