"We're trying to change the style of play, we have our young players developing with better technical ability with the ball. But it doesn't mean anything, really, because we have to keep improving as a team", Southgate told ESPN when asked what he would see as a successful World Cup.
Former England defender Rio Ferdinand is a huge advocate of taking Alexander-Arnold.
With an allowance of just 23 players, there were always going to be a few missing out who perhaps deserved to be on the plane, but there are three absences in particular who have stoked a response from England fans across social media.
Lallana's injury-ravaged season has cost him, with England also denied the services of Alex Oxlade-Chamberlain following the knee injury he sustained last month.
Chelsea captain Gary Cahill is back in the fold but Hart's poor form during a season-long loan spell at West Ham has cost England's number one at their three previous major tournaments his place. John Stones has had a hard season at Manchester City, but Southgate is a confirmed admirer and the 23-year-old is seen as crucial to plans to play three at the back.
Hart, Wilshere miss out as England announce squad for 2018 World Cup
This is an England squad that lacks quality in some areas.
The only member of the group to have reached a half-century of caps, the Dronfield-born Chelsea skipper's experience will be invaluable.
Southgate's number one goalkeeping choice for Russian Federation is sure to be broached on Thursday morning, along with questions on the captaincy and composition of his stand-by list.
The 23-man England squad was announced by video on Wednesday afternoon, with five other players also named on a standby list.
"All of the guys on standby have been really professional in their approach to this".
"I could've had easier conversations by keeping them involved".
'Lethal Weapon' Star Damon Wayans Tweets Grievances About Former Co-Star Clayne Crawford
He also claimed Crawford "hit another actor in the mouth with a bottle of green tea and busted his mouth open". Wayans also accused Crawford of seeking to make women cry and striking fear in cast and crew members.