Trent Alexander-Arnold, 19 years old, without a cap to his name: in.
While this is not his first major tournament for the Three Lions (he was also a member of their Euro 2016 squad), the World Cup is the ultimate prize in the footballing pantheon, and this is the youngster's first experience of the biggest stage in world football.
Gary Cahill was left out of Southgate's previous squad, but his seven appearances at major worldwide tournaments provides much-needed experience.
"History tells us that one of those standby players may end up in the squad, as it's very unusual for us to get through the end of the season and our two preparation games without any issues", Southgate added.
Widespread reports on Tuesday revealed that Gareth Southgate had chose to leave West Ham goalkeeper Hart and Arsenal midfielder Wilshere at home, and there is indeed no place for either despite the pair having amassed more than 100 caps between them. Here's a look at the six who will be making the trip next month.
'We have a lot of energy and athleticism in the team, but players that are equally comfortable in possession and I think people can see the style of play we've been looking to develop'.
Alexander-Arnold, uncapped by England's senior side, was a surprise inclusion in Gareth Southgate's group for the forthcoming tournament in Russian Federation.
While the Liverpool attacking midfielder has not started a Premier League match since New Year's Day, he is a favourite of Southgate.
"It was an unbelievable moment to find out I was going to go to the World Cup, especially at a young age". "Today that dream came true". "Thank you for all your kind messages!" I said, "no" and he said, 'Have you got anything planned around the time of the World Cup?'.
Ruben Loftus-Cheek is another bold selection by Southgate, a midfielder who wasn't deemed good enough to play for Chelsea this season but has impressed on loan at Crystal Palace and starred on his global debut against Germany in November.
Central midfield seems light on experience and cover - Jordan Henderson and Eric Dier are the only real mainstays - but Southgate is confident the likes of Loftus-Cheek and Jesse Lingard can fill in.