Only three of the 23 players are over the age of 28 - the youngest being Alexander-Arnold. Gary Cahill, 32, leads the team in experience, racking up over fifty caps.
The West Ham keeper is reportedly extremely disappointed with Southgate's decision, and although it has been suggested that he took the cut in gracious fashion, he's also believed to be blaming David Moyes - who has been fired by the Hammers today - for his downturn in fortunes. But the Newcastle midfield will have to watch the World Cup at his home this time around.
"The first call-up for Trent Alexander-Arnold is well deserved", said Southgate. Lascelles is a born leader, the vital component in Newcastle's defence and he would have helped provide a degree of organisation to the Three Lions' defending.
There is a distinct lack of creativity in England's midfield after Southgate made a decision to overlook Jack Wilshere and Jonjo Shelvey too. Harry Maguire is one of the surprise call-ups to the Three Lions squad for Russian Federation. Chris Smalling, who has had a good season for Manchester United, was also overlooked because Southgate wants defenders who are comfortable in possession. It is certainly a nod to the new era, with Southgate including just five players - Jordan Henderson, Raheem Sterling, Danny Welbeck, Phil Jones and Gary Cahill - who played in the last World Cup in 2014.
There were more potential young candidates for a spot, with Jadon Sancho and Ademola Lookman among those to be tipped, but Southgate also needs a blend of "experience" in his squad.
Hart has been in poor form this season. Mandatory Credit
Harry Kane, Jamie Vardy, Marcus Rashford, Sterling and Welbeck are England's attacking options.
Everton man Pickford and Stoke City's Butland are expected to battle it out for a start in the opening group game against Tunisia, although Heaton says the race is wide open.
The 23 players were announced on Wednesday afternoon with goalkeeper Joe Hart and defender Ryan Bertrand, both regulars throughout the qualification campaign, missing from the list.
It's fair to say that Gary Cahill isn't everyone's favourite centre-back, but the decision to bring him to Russian Federation is the right one. But these the most talented players in Europe at this moment.
However, those recent performances haven't done enough to convince Gareth Southgate to bring him to Russian Federation as part of his 23-man squad for the tournament.