In a Twitter video, he said ahead of his show that night, the doors at The O2 arena in London will open early, so fans can come and watch the World Cup game on the massive screens on stage. We go 1-0 down, in danger of going home.
Southgate said he was convinced that win or lose on Wednesday, his team have a bright future after decades of English under-achievement on the worldwide stage.
The names of Sir Alf Ramsey and his players - still the only 11 Englishmen to play in a World Cup final - will be recalled forever and their stories told whenever the nation's landmark moments in sport are revisited.
"We're going into a semi-final but it just seems like it's the next step on the journey", Southgate said.
Croatia can hurt teams further forward, though. "We hope for a victory". "I know I can play better than that".
Now he will turn his attention to England, as the two sides meet Wednesday at the Luzhniki Stadium in Moscow for a spot in the World Cup final.
France coach Didier Deschamps said he was delighted to have the chance to bury the pain of the Euro 2016 final, which his side lost on home soil to Portugal.
It was a painful defeat for Belgium, foiled at the semi-final for the second time in their history, as the clock ticks on their so-called "golden generation" of players.
England hasn't played in the semifinals of a major tournament since Southgate's penalty kick at Wembley was saved by Andreas Koepke 22 years ago, and Andrea Moeller put the next kick over David Seaman and under the crossbar. "We're really proud in the style that we've played, with the intelligence that we've played, and that we've performed under pressure and dealt with hard situations in games where we've had to wait until the last minute to score, we've had to recover from conceding in last minute, we've been through extra time, penalties".
Here's a look at the schedule for the rest of the World Cup, a look back at how France performed on Tuesday and a preview of what to expect from the huge game on Wednesday.
"Moscow is one of the best places I have ever been", he added. "We'll repeat that this Sunday", said one supporter, Sebastien.