Thursday 5 July 2018 12:45, UK
As England prepare to face Sweden in the World Cup quarter-finals, we take a look at the men who have been assisting boss Gareth Southgate at Russia 2018.
England and Sweden go head to head at the Samara Arena on Saturday afternoon following their dramatic penalty shootout win over Colombia on Tuesday night.
That was England's first-ever victory on penalties in the World Cup, with goalkeeper Jordan Pickford the hero after keeping out Carlos Bacca's spot kick, aided by research done with his coach Martyn Margetson.
So, who is in Southgate's backroom team, what exactly are their roles and how will they be assisting the England manager during the competition?
Enjoyed a very brief playing career with Derby, Bury, Husqvarna FF in Sweden and Northwich Victoria, before giving that up to become a coach at Crewe aged just 21.
Having worked his way up Crewe's youth ranks to succeed Dario Gradi in the hot seat at Gresty Road in 2007, Holland was appointed Chelsea's reserve team manager two years later.
He then became Andre Villas-Boas' assistant in the summer of 2011, a role he went on to fulfil at Stamford Bridge under Roberto Di Matteo, Rafa Benitez, Jose Mourinho, Guus Hiddink and Antonio Conte.
In fact, the 48-year-old helped oversee Champions League, Europa League, Premier League, FA Cup and Capital One Cup triumphs in his role as Chelsea assistant manager, bringing him to the attention of then England U21 coach Southgate in 2013.
Holland worked with Southgate on a part-time basis and when the latter got the England job in August 2016, he also took on the role with the seniors. And that became full time when he left Chelsea after eight of "the best years of my life" at the end of the 2016-17 season.
He is known to be very popular with the players and someone Southgate leans heavily on when it comes to training sessions, team selections and tactics.
The Glaswegian had a journeyman career with 11 lower-league clubs in Scotland and England, before moving across to the United States, where he hung up his boots in 2014.
Russell's high point was winning the 2008 Scottish Second Division Player of the Year award after a record-breaking season at Airdrie in which he scored 26 goals in 43 games.
After calling it a day, the Scot tried his hand at modelling - even joining Christina Aguilera on stage at the MTV Video Music Awards in Edinburgh - before starting his career as a striker's coach.
The 37-year-old lists the likes of Rangers' Martyn Waghorn, Stoke's Saido Berahino and Benik Afobe, Watford's Andre Gray, Middlesbrough's Ashley Fletcher and Portugal's Euro 2016 final match-winner Eder among his clients on his website superiorstriker.com.
In fact, Rafa Benitez brought Russell in to help with misfiring forward Aleksandar Mitrovic at Newcastle, while Holland also employed him to work with Chelsea's players last season.
Having assisted Holland at the Bridge, Southgate decided to add Russell to his backroom team ahead of last summer's World Cup qualifier in Scotland, a role that was extended to all age groups and the women's team at the FA.
"There are very few people who actually work at this level of detail - looking at technique, where goals come from," Southgate said of Russell.
"With more senior players that tends not to happen because you are going from game to game. But Allan focuses specifically on technique."
Russell, who describes himself as the "world's No 1 individual striker coach" on his website, spoke to Sky Sports about his skills: "I assess them (strikers). As soon as they come in, I know what's wrong with the body mechanics, if their balance is right, if their technique is good enough.
"Is their standing foot far enough forward when they strike the ball? Are they connecting with the right part of the ball? How are they rotating their hips?"
The Welshman started out at Man City, making his debut for the club after covering for suspended No 1 Tony Coton in a Manchester derby at Old Trafford in May 1990.
The shot-stopper went on to make 50 appearances for the club, before ending his career at Cardiff in the summer of 2007, during which time he won his one and only Wales cap in a friendly with Canada in May 2004.
Having hung up his gloves, Margetson became Cardiff's goalkeeper coach - initially as player-coach - a role which saw him also join Wales' backroom team under then managers Gary Speed and Chris Coleman.
In the summer of 2011, Margetson teamed up with West Ham boss Sam Allardyce for the first time, before following him to England, Crystal Palace and Everton.
And Southgate kept Margetson on to help out with England's young 'keepers, one of who - Jordan Pickford - he worked closely with at Goodison Park in the second half of last season.