GARETH SOUTHGATE revealed why he called up Ezri Konsa as he explained England's new formation against Switzerland.
Konsa replaced suspended Marc Guehi in defence as Southgate switched from 4-3-3 to three at the back.
And Southgate also explained why Bukayo Saka and Phil Foden are featuring BEHIND main striker Harry Kane, rather than alongside him.
But he sprang a surprise by starting Saka on the right of a four-man midfield, with Kieran Trippier on the left.
Foden himself discussed his new role next to Jude Bellingham - in front of that four.
Ahead of his 100th game in charge, Southgate hailed Aston Villa star Konsa's "pace" .
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And he hinted England's latest tactics are partly aimed at countering Swiss tactics.
Explaining Konsa's selection, Southgate told the BBC: "We've tracked the players all season. He's performed consistently well.
"He did really well when he came into the team against Brazil and Belgium.
"He'a got pace and he's had a fantastic season with Aston Villa. It's a great opportunity for him."
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Turning to Arsenal winger Saka, Southgate said: "He's a player who works well for the team, does well in one-on-one situations.
"He provides so much, he's got a goal threat, so he's been a really important player for us for a number of years now."
And of his new formation, Southgate added: "We're always trying to get the best out of everybody.
"And I think generally speaking over 99 games we've done that.
"So today is a brilliant opportunity to get to the semi-final - against a team that are playing well and full of confidence.
"We can't be giving them the game they want. So we must be up to that challenge."