Portfolio Diversification Lessons from Tuchel’s England Squad

When Thomas Tuchel announced his 26-man England squad for the 2026 World Cup, the reaction was immediate and it was loud.

Phil Foden. Cole Palmer. Trent Alexander-Arnold. Harry Maguire. Four names that dominate back pages, that fill stadiums, that carry the weight of expectation every time they pull on a shirt. Left out. All of them.

The reaction was predictable. Social media erupted. Maguire posted that he was "shocked and gutted." Pundits queued up to call it the most controversial squad selection since 1998. And yet, when Tuchel sat in front of the cameras to explain himself, his reasoning was disarmingly simple: "The best possible team is not necessarily the 26 most talented players. Teams win championships."

He went further. "We didn't want to play players out of position. We wanted to give them a clear role. For some of them, it is just the amount of players in a certain position."

In other words: Foden and Palmer are both outstanding in the number ten role. But you can only play one number ten at a time. If your squad is stacked with players doing the same job, you don't have depth. You have an overlap. And overlap, in football as in investments, is quietly one of the most expensive mistakes you can make.

The problem with eleven strikers

Think about what a well-constructed football squad actually looks like. You need goalkeepers who are technically different from one another. One commanding in the air, one exceptional with the ball at his feet. You need centre-backs who can step into midfield, full-backs who can press high and recover quickly. Midfielders who can defend, midfielders who can create, midfielders who can do both. And forwards of different types: the target man, the runner in behind, the creative force who drops deep to link play.

What you absolutely do not need is five players who all want the ball in the same zone, playing the same pattern, filling the same role. That isn't strength in depth. That's concentration risk dressed up as talent.

Tuchel's squad reflects this. Jude Bellingham is your creative, high-energy number ten who can arrive into the box. Eberechi Eze is the precise, technically elegant option from the same position. Morgan Rogers offers something different again: physical, direct, capable of holding the ball and bringing others into play. Three players, one position, three genuinely distinct profiles. That is actual depth.

Meanwhile, Tuchel has built his forward line with different weapons for different moments: Harry Kane as the fulcrum, Ollie Watkins as the runner, Ivan Toney (back in a surprise recall after scoring 32 goals in 32 games in Saudi Arabia) as a physical presence who can change a game from the bench.

Sound familiar?

It should, because a Discretionary Investment Manager building a properly diversified portfolio is doing exactly the same thing.

The most common misconception about diversification is that it simply means owning lots of different things. It doesn't. It means owning things that behave differently from one another, that respond differently to the same conditions, that don't all fall over at the same time. A portfolio holding ten different technology funds is not diversified. It is concentrated, regardless of how many line items appear on the valuation.

True portfolio construction works in layers. At the broadest level, asset classes: equities for growth, bonds for stability and income, property for inflation linkage and real asset exposure, alternatives for genuine non-correlation. Within equities, geographical spread: domestic, developed international, emerging markets, each with its own economic drivers and return characteristics. Within fixed income: government versus corporate, short duration versus long, investment grade versus high yield.

Each holding has a clear role. Each is chosen not just for what it might deliver, but for how it interacts with everything else around it. When equities sell off sharply, high-quality government bonds typically hold their value or rally the goalkeeper in a back four of panicking outfield players. When inflation rises, real assets and commodities tend to compensate for what fixed income loses. When domestic markets struggle, exposure to other geographies can carry the team through.

And just like Tuchel's squad, the discipline is in what you leave out. You don't include an asset because it has had a good season, any more than you pick a player because they were outstanding two years ago. Past performance, as any experienced investor knows, is exactly as reliable as Harry Maguire's current England career.

Different opponents, different conditions

England's group stage at this World Cup presents three genuinely different challenges. Croatia is tactically disciplined, experienced, built on shape and organisation. Ghana is athletic, direct, and capable of pressing high and playing on the front foot. Panama is defensively stubborn, hard to break down, and content to frustrate. Tuchel needs a squad capable of adapting to a different approach, a different tempo, a different set of decisions depending on the night.

Your portfolio faces exactly the same challenge. The economic conditions you navigate will shift continuously across an investment cycle. In a period of strong growth, equities roar ahead, and the defensive elements of a portfolio can feel like dead weight. In a downturn, those same defensive positions look like the wisest thing you've ever owned. In an inflationary environment, the conventional playbook for bonds needs to be reconsidered entirely. In a deflationary shock, quality growth equities can become a refuge rather than a risk.

A portfolio that is configured for only one type of economic environment, say, the extended bull market in US technology stocks that defined the decade before 2022, is the financial equivalent of preparing your team only for opponents who want to play open, expansive football. The moment conditions change; you are caught out of position.

This is why a professionally managed, genuinely diversified portfolio holds assets that look redundant in certain conditions. They are not redundant. They are the squad players who do not start every game but who, at a critical moment, change everything.

The discipline of the difficult call

Perhaps the most instructive part of Tuchel's selection is not who he chose, but the clarity with which he made the difficult calls. He did not pick Foden because the fans expected it. He did not include Alexander-Arnold because the name carries history. He looked at the role the player would fill, the interaction with the players around them, and whether the squad as a whole would be stronger for the inclusion.

That discipline is rigorous, unsentimental, and role-specific; it is what separates a properly constructed investment portfolio from a collection of individual positions accumulated over time. The question is never 'is this a good company?" or "has this fund had a strong run?" The question is: "What role does this play in the overall portfolio, and does it complement what is already there?"

When a portfolio is built to that standard, it doesn't guarantee winning every quarter. No squad wins every match. But it creates the conditions to perform across the full range of environments, to absorb shocks without a catastrophic result, and to put you in a position to go deep into the tournament when it matters most.

After all, England haven't won a World Cup since 1966. The evidence suggests that selecting on star names alone isn't working. Tuchel has decided to try something different.

Perhaps your portfolio deserves the same honest conversation.