It is often remarked upon how Chelsea's conveyor belt of managers under Roman Abramovich goes against the common consensus in football that stability is a prerequisite for success on the pitch.
Chelsea chop and change and keep winning trophies. And those triumphs, achieved by an array of different managers with varying ideas and approaches, might just be informing the think tank plotting England's route to glory in Euro 2020.
Gareth Southgate's right-hand man, Steve Holland, worked alongside six managers in six years at Chelsea from 2011 until 2017 and saw the club win the lot - two Premier Leagues, the League Cup, the FA Cup, the Champions League and the Europa League. He left to focus on his work with the national team alongside Southgate, with whom he has partnered since their days with the Under 21s.
That experience is vital for England's set-up now. Southgate rightly continues to earn plaudits as England advance through the tournament but his record as a manager is on the inexperienced side.
He last took charge of a club match at Middlesbrough in 2009, in the Championship. While experience isn't everything, it certainly helps and it is worth noting that in the other semi-final of the Euros, Champions League and LaLiga winner Luis Enrique pits his Spain side against Italy, coached by Serie A and Premier League champion Roberto Mancini. That know-how counts and it's one of many assets Holland brings to England's set-up.
It's something Southgate himself freely stated to Sportsmail only last month. 'In my view, Steve Holland is a legend,' he said. 'He's the most experienced English coach in the country, right through from developing young players to winning the Champions League and Premier League with some of the best managers in the world.'
Steve Holland (left), Gareth Southgate's No 2, is a vital part of the England set-up
Southgate and Holland have worked together from the England Under 21 fold up to the seniors
Holland experienced how to win the biggest trophies during his time as a Chelsea assistant
So Holland is clearly a valuable addition to the England coaching fold, and it's something that has been recognised across the game. Speaking ahead of Euro 2020, Cesc Fabregas said Holland could be a hidden gem in England's bid for glory.
'Holland's meticulous coaching brain is England's secret weapon,' Fabregas wrote in his Telegraph column.
'Assistant managers can be undervalued when it comes to handing out praise to people for the performances and results of a team, but, in Steve Holland, England have one of the very best.
'Steve and I worked together for three years and won two Premier League titles together at Chelsea, and I can tell you that he was very important to our success.
'He will listen to you and talk a lot of sense, but I think the thing that makes players really respect Steve is he is not the kind of assistant who will just listen to the manager and do whatever he says. He has his own personality and his own opinion, and that is really important.'
Holland takes a moment to celebrate with Raheem Sterling after the 4-0 win against Ukraine
Sportsmail reported how Holland challenged Jose Mourinho (left) over his tactical plans
