Chelsea's convincing 5-1 victory over Bournemouth showcased the ferocity of their attack under Xabi Alonso. However, the final score can easily mask the alarming number of chances conceded at the other end. In their first six Premier League matches, the Blues have netted 15 times while leaking 13 goals. The tactical setup is in dire need of a more reliable defensive structure, as brilliant finishing cannot consistently compensate for defensive frailties.
Five goals do not equate to total control
Against Bournemouth, Chelsea were 2-0 up within just over two minutes. Joao Pedro added a third moments after half-time, and by the time the final whistle blew, he and Jordan Henderson had both scored twice, with Morgan Rogers adding the icing on the cake.
At first glance, this appeared to be a powerful statement following a painful 3-0 defeat to Brentford. But it was worth noting that Bournemouth carved out plenty of clear opportunities well before their consolation goal. In the first half, Ryan found himself in a threatening position, forcing Emiliano Martinez into a stunning save, with Ryan Christie lurking for the rebound. Antonio Silva also made Martinez stretch again with a header.
The expected goals (xG) statistics perfectly highlighted the disparity between the result and the quality of chances conceded: Chelsea generated 1.1 xG while Bournemouth excelled with 1.38 xG. This doesn't detract from their deserved win—Chelsea finished clinically and punished their opponents' mistakes. Yet five goals should not create the illusion that the Blues shut down their rivals completely. Alonso's side excelled in conversion but failed to address significant deficiencies at the back.
Statistics raise alarm bells
Prior to their clash with Bournemouth, Chelsea had conceded 12 goals in five league games, allowing 32 shots on target against them—at that point, the worst figures in the division. Their loss to Brentford extended Chelsea's run of league matches without a clean sheet to 21 games, a streak that reached 22 when Evanilson struck.
It should be noted that this streak began long before Alonso's tenure. The current manager didn't create every defensive vulnerability he inherited, nor is he responsible for the accumulated baggage. Nevertheless, his own record requires scrutiny. Chelsea conceded twice to Fulham, three times to Brighton, and two goals each to Arsenal and Hull City, not to mention three to Brentford and one to Bournemouth. They haven't managed to keep a clean sheet in the Premier League this season.
This issue runs much deeper than mere bad luck or a single failed challenge from a defender. A team that allows this many shots on target consistently puts their goalkeeper and centre-backs in positions that the rest of the side should have addressed beforehand.
Attack thriving against the odds
Chelsea scored their 15 league goals from chances worth only 8.4 xG. Their positive gap of 6.6 is the largest in the division according to data released following the sixth round.
Their finishing has reached exceptional levels. Henderson opened the scoring with a strike from around 20 yards, Rogers curled in from a second attempt, and then Henderson scored directly from a free-kick from 25 yards. Joao Pedro needed just two shots to grab a brace.
These individual skills deserve admiration, but they also lead to overlooking fundamental defensive problems. Chelsea cannot hope to build a reliable season converting low-probability chances into goals at such an absurd rate. There will inevitably come nights when a long-range drive misses the target, a free-kick hits the wall, or the opposing goalkeeper finds his groove.
If the team continues to concede this amount of chances, their margin for error will become critically small. The issue isn't that Chelsea are scoring too many; it’s that their dazzling finishing is currently providing them with far more leeway for defensive mistakes than their tactical structure warrants.
The system's title doesn’t explain the core issues
Before the international break, Alonso toyed with a three-man defence, but against Bournemouth, Chelsea deployed a 4-2-3-1 setup: Josh Achéampong, Maxence Lacroix, Levi Colwill, and Pep Chavarria lined up behind Jordan Henderson and Moises Caicedo, while Pedro Neto, Cole Palmer, and Morgan Rogers supported Joao Pedro.
This is significant because defensive lapses cannot simply be attributed to the phrase 'three centre-backs leave the flanks open.' More pressing questions involve the positions the Chelsea players occupy during transitions. How high does the full-back push? Which midfielder provides cover for his area? Who blocks the passing lanes into the centre if the first challenge fails? How quickly do attacking players track back?
A nominal four-man defence can defend poorly with dreadful cover, while a trio can do so with outstanding support. No formation label guarantees correct spacing between players. Alonso's challenge is to ensure attacking movements are compatible with subsequent defensive actions.
Best combinations open vulnerabilities at the back
The fourth goal against Bournemouth illustrated perfect attacking interplay. Rogers switched play to Chavarria, whose low cross found Joao Pedro for a simple finish. Chelsea need such threats. Yet when Chavarria pushes forward, the team must understand who provides cover for the space left behind.
If the nearest centre-back shifts to the flank for support, another defender must plug the central gap. If a midfielder shifts, another must stay to control the core area. This is not a reason to forbid full-backs from making attacking runs. These are basic defensive principles that make such incursions safe.
The same applies to Palmer and Rogers, operating underneath Joao Pedro. Their close proximity allows Chelsea to execute wonderful combinations at goal. However, if both are beyond the ball when possession is lost, the midfield requires support to delay the counter-attack. A thrilling attacking structure becomes brittle when each forward movement is considered in isolation without regard for defensive positions.
Caicedo provides help but can't be the sole safety net
Against Bournemouth, Moises Caicedo made his first start of the league season. Xabi Alonso notably acknowledged the difference his return made, stating that a balanced and powerful midfield puts the team in a better condition.
This improvement was evident. Henderson provided an assist, scored twice, and was active in interceptions, while Caicedo offered Chelsea a sturdier presence in the centre. However, the team’s defence cannot solely rely on Caicedo being able to extinguish every emerging problem. If he shifts to the sideline to contest possession, the central zone needs cover. If he remains central, the full-back requires assistance from elsewhere. If he engages in high pressing, the defensive line must be ready to support that movement.
Otherwise, his class merely postpones the moment the structure is fully opened up. Chelsea also need to manage his fitness. After being gradually worked back into form during the international break, he was substituted for Romeo Lavia on 72 minutes. A system that only works when one midfielder can cover excessive distances cannot be deemed reliable.
Vulnerability at set-pieces
Not every goal conceded can be explained away by a loss of possession when too many players are caught upfield. Evanilson scored from a corner at the near post, following a flick and scramble in the area. Caicedo attempted to clear but the ball ricocheted off the striker’s leg and into the net.
The final touch was an unfortunate fluke. However, the preceding chain of events still called for Chelsea to defend the initial delivery properly, react to the flick-on, and win the second ball. This is a fundamentally different task than stopping a counter-attack from open play. The position of the attacking full-back moments earlier does not excuse this episode.
Thus, Alonso requires not just one fix, but several adjustments. Chelsea must improve their spatial distribution in possession and their organisation when defending set-pieces. That corner nearly turned the match: at 3-1, Bournemouth applied pressure and for a brief time unsettled the hosts before Chelsea got their fourth. Just one avoidable moment was enough to spark the opposition back into the game.
Early leads do not guarantee control
In five of their six league matches, Chelsea scored within the first seven minutes. Six of their 15 goals came in this short period, and in three games they were already ahead by the second minute. This should provide a significant advantage.
Early leads allow a team to pick their moments, forcing the opponent to commit numbers forward and attack the spaces that arise. However, Chelsea far too often turned this into the beginning of another open exchange.
They quickly scored against Arsenal but ultimately lost. They raced ahead against Hull City and ended up drawing. Brighton scored three, despite Chelsea clinching a 4-3 victory. The match against Bournemouth was calmer, but the overarching, concerning symptom remained: getting ahead and controlling the game are two entirely different skills.
Alonso must teach his team when the situation calls for another forward surge and when a more secure pass or compact shape is necessary, or when a few minutes of control without easy access for the opponent to goal is warranted. This does not mean abandoning attack. It means valuing their lead more wisely.
What Alonso must change
The first priority should be clear coverage behind the ball. When one full-back pushes forward, the remaining defenders and midfielders must have a practiced plan for a loss of possession, rather than improvising on the fly.
The second step is greater discipline around the double pivot. Henderson can support attacks, and Caicedo can press for the ball, but both maneuvers require someone else to protect the space they leave behind.
The third change involves more selective pressing. When the nearest attacking player presses alone, and the midfield cannot support him, Chelsea should restore their shape rather than continuing the chase, which only opens another corridor for the opponent's pass.
Attention to set-pieces is also crucial: battling at the near post, reacting to flick-ons, and positioning for second balls cannot be an afterthought in the broader tactical discussion.
Finally, the Londoners need to close the gap between their finishing and game control. More high-quality chances, fewer conceded shots, and reducing high-stakes saves required of Martinez will make results less reliant on stunning long-range goals.
Structure is part of the problem, not an excuse
Alonso inherited a squad plagued by a long-standing inability to keep clean sheets. An epidemic of injuries and constant rotation in midfield made the early weeks of his tenure all the more difficult. Individual errors and slow reactions to set-pieces have only compounded the damage.
However, it is the structure established by the manager that dictates how often these individuals are forced to defend in critical and demanding situations.
Chelsea's victory over Bournemouth offers a glimmer of optimism: Caicedo's return, Henderson's brilliant contributions, and the attacking combinations leading to five goals. Yet, it also serves as a cautionary tale with regards to the saves Martinez was forced to make and the quality of chances created by the visitors.
Chelsea should not have to choose between a potent attack and competent defence. They need their players' positioning behind the attack to be as well thought out as their movements in front. Until that happens, evenings featuring five goals will remain a thrilling answer to the question they shouldn't be facing so frequently: how many more must Chelsea score to finally feel secure?
