If you’ve watched Chelsea this season, you’ve probably felt that familiar knot in your stomach when the ball rolls toward our box. The numbers don’t lie: through the first half of the 2025/26 Premier League campaign, The Blues have conceded a notable number of goals from individual defensive mistakes. It’s not a crisis of talent—this squad is loaded with young stars—but something is clearly off. Let’s dig into what’s going wrong, why it’s happening, and what can actually be done about it.
The Recurring Patterns: Where Are We Leaking?
To understand the problem, we need to look beyond the scorelines. The errors aren’t random; they cluster around three specific scenarios that keep repeating like a bad dream.
Pattern 1: High-Line Disasters Without Pressure on the Ball. Under both Enzo Maresca and now Calum Macfarland, Chelsea has tried to play a high defensive line. The idea is sound—compress play, win the ball early—but execution has been brutal. Too often, the centre-backs step up while the midfield fails to close down the passer. That leaves a simple through-ball cutting through Levi Colwill and the rest like a knife through butter. We saw it against Aston Villa in September, against Brighton in October, and again in the FA Cup quarterfinal buildup. The common thread? A disconnect between the back four and the midfield pivot.
Pattern 2: Ball-Playing Risks in Dangerous Areas. Maresca wanted his defenders to build from the back. Macfarland hasn’t abandoned that philosophy entirely. But when Moises Caicedo or Enzo Fernandez drop deep to receive the ball under pressure, and the opposition presses in a coordinated block, we’ve seen a spike in turnovers. Robert Sanchez has been involved in several errors leading to goals this season—some from rushed passes, others from hesitation. The desire to play out is admirable, but the risk assessment is off. When you’re 1-0 up away from home, a long ball to Liam Delap is often the smarter play.
Pattern 3: Set-Piece Chaos. This one is maddening because it’s preventable. Chelsea has conceded from corners and free-kicks where the marking has been poor—for example, against Arsenal and Newcastle earlier in the season. The lack of a consistent zonal or man-marking system has left us vulnerable, and it’s a pattern that has persisted across different managers this season.
Why Is This Happening? The Root Causes
Let’s be honest—this isn’t just bad luck. There are structural reasons behind the errors.
The Age Factor. Chelsea has one of the youngest squads in the Premier League, with an average age around 23. That brings energy, but it also brings inexperience. Colwill is still learning to organise a back line. Malo Gusto, for all his attacking promise, gets caught upfield too often. Reece James, when fit, is a leader—but his injury record means the defence rarely has a consistent voice. Young defenders make mistakes; it’s part of the process. The problem is that when you’ve invested heavily in that youth, patience wears thin.
Managerial Instability. Multiple head coaches in one season—Maresca, then a brief interim spell, now Macfarland—means different defensive systems. Each change resets the tactical clock. Players are still learning each other’s tendencies, let alone the manager’s specific instructions. Macfarland has tried to simplify things, but you can’t build a solid defensive unit in a few weeks. It takes months of repetition and trust.
Midfield Balance Issues. Caicedo and Fernandez are both excellent, but they’re not a classic holding pair. Both want to get forward, both want to dictate play. When they push up, the space in front of the centre-backs becomes a highway. Opponents have exploited this ruthlessly, especially in transition. The lack of a dedicated defensive midfielder—someone like a younger N’Golo Kanté—leaves the back four exposed.
What Can Be Done? Practical Solutions
This isn’t a lost cause. The talent is there, and with a few tweaks, Chelsea can tighten up significantly.
Solution 1: Implement a Clear Set-Piece System. This is the low-hanging fruit. Macfarland needs to pick one method—zonal or man-marking—and drill it relentlessly. Assign specific roles: Colwill on the near-post runner, James on the far-post threat, a midfielder tracking the second ball. It’s not glamorous, but it’s effective. Look at how Arsenal transformed their set-piece defence under a dedicated coach; Chelsea needs the same focus.
Solution 2: Protect the Back Four with a Screen. Against top sides, consider dropping Caicedo into a pure defensive role, with Fernandez given more freedom to roam. Or, if the squad allows it, give minutes to a more defensively-minded midfielder from the academy. The key is to reduce the space between the midfield and defence, forcing attackers to play in front of us rather than through us.
Solution 3: Simplify the Build-Up in Key Moments. Not every phase of play needs to be Guardiola-esque. When the opposition presses high, especially in the final 20 minutes of a tight game, give Sanchez the green light to go long. Delap and Joao Pedro are capable in the air; use them. Reducing the number of high-risk passes in our own third will cut down on errors immediately.
Solution 4: Build a Consistent Partnership at Centre-Back. Colwill needs a stable partner. Whether it’s Trevoh Chalobah or a new signing in January, Macfarland should stick with one pairing for at least five consecutive games. Communication and understanding come from repetition. Chopping and changing every week is killing us.
When the Problem Requires a Specialist
Some defensive issues are beyond tactical tweaks. If the errors persist despite clear instructions and training ground work, it might be a personnel problem. That’s when you need a specialist: a dedicated defensive coach who works solely on positioning, decision-making, and game management. Many top clubs have one. Chelsea should too.
Also, if the goalkeeper position remains a liability—Sanchez has the physical tools but the mental errors are mounting—it might be time to look at the market. A reliable, calm presence between the sticks can save points over a season. That’s not a luxury; it’s a necessity.
The Road Ahead
Chelsea’s defensive errors aren’t a death sentence. They’re a symptom of a young, transitional squad learning on the job. The patterns are identifiable, the causes are clear, and the solutions are achievable. Macfarland has the tactical brain to fix this, but he needs time and stability.
For now, as fans, we can hope that the lessons from these mistakes stick. Because if they do, this team has the firepower to turn those errors into a distant memory. And if they don’t? Well, we’ll be having this conversation again next season.
For more match analysis and live coverage, check out our match coverage hub and follow our League Cup live blog for real-time updates. And if you want to see how these defensive issues play out in knockout football, our FA Cup live blog has you covered.