7 Things the Defending Champions Must Fix After Their First Defeat

The unbeaten start is over. The aura has been punctured. And the manner of the collapse at Brighton suggests Arsenal’s problems run deeper than a single bad afternoon.

Arsenal are no longer unbeaten. The defending Premier League champions were dismantled 3-0 by Brighton & Hove Albion at the Amex Stadium on September 19, 2026, suffering their first defeat of the season and surrendering top spot to Manchester City on goal difference. It was their heaviest league defeat in over three years.

Mikel Arteta didn’t mince words. “We didn’t respect any principle of play,” he said. “They were another gear from us in the basics of the game”. Bruno Guimarães, making his first Premier League start for the club, admitted the dressing room was in revolt: “Everyone was complaining about ourselves, about the level we played today. It’s not acceptable”.

This wasn’t a smash-and-grab. Brighton were better from the first throw-in. So what actually went wrong — and what must Arsenal fix before the season slips away?

1. The Press-Resistance Problem

Arsenal’s entire identity under Arteta is built on playing out from the back. Against Brighton’s man-to-man press, that identity collapsed.

Arteta described the issue with clinical precision: “When we did regain the ball, especially in our own half, the amount of technical errors that we did and we didn’t respect any principle of play that you have to get out of those man-to-man situations”. The Gunners were “extremely poor technically” on the ball, repeatedly losing possession in dangerous areas and inviting wave after wave of Brighton pressure.

This isn’t new. Arsenal have struggled against aggressive man-marking systems before, but Brighton exposed the flaw with brutal efficiency. The midfield trio of Rice, Guimarães, and Ødegaard couldn’t find solutions. The build-up became predictable. And when you can’t play out against a press, everything else falls apart.

The fix: Arteta needs a structural solution, not just a motivational one. That means more movement from the front line to create passing lanes, more willingness to go long when the short option isn’t there, and potentially a change in midfield personnel to add a player comfortable receiving under pressure with his back to goal.

2. The Forward Line Is Dangerously Thin

Paul Merson warned about this in early September. He was right.

Arsenal sold Gabriel Martinelli, Gabriel Jesus, and Leandro Trossard this summer but only signed Christos Tzolis to replace them. The result is a forward line that lacks both depth and variety. Against Brighton, Kai Havertz “struggled to impose himself” and the lack of a genuine game-changer off the bench was glaring.

Viktor Gyökeres, signed the previous summer to be the answer, has yet to start a Premier League match this season. When Arsenal needed a goal at 2-0 down, their options were limited. When they needed someone to hold the ball up and relieve pressure, there was no one.

Merson’s assessment was blunt: “You look at Havertz and Gyökeres — I like those two but they’re not going to give you sleepless nights”.

The fix: Arsenal need to be active in the January window. A forward who can create something from nothing — the kind of player they chased in Vinícius Júnior and Julián Álvarez — is no longer a luxury. It’s a necessity.

3. Creativity Has Flatlined

The numbers are damning. Arsenal rank 15th in the Premier League for big chances created. For a team with aspirations of retaining the title, that’s not a blip. It’s a crisis.

Against Brighton, the Gunners created almost nothing from open play until the game was already lost. Martin Ødegaard has created three big chances this season, but none have led to an assist. The creative burden is falling on too few shoulders, and those shoulders are tiring.

This is part of a longer trend. Arsenal’s chance creation has been declining for years, masked by set-piece excellence and individual moments of brilliance. When those dry up — as they did at the Amex — the underlying problem becomes impossible to ignore.

The fix: Arsenal need to rediscover their attacking patterns. That means more rotation in the attacking third, more overlaps from full-backs, and less reliance on Bukayo Saka to beat three men and deliver a perfect cross. The structure has become stale.

4. Defensive Solidity Has Evaporated

Arsenal built last season’s title on a defence that conceded just 27 league goals. They had conceded only once in their opening four matches this season. Against Brighton, they conceded three in 57 minutes.

The warning signs were there in pre-season. Without William Saliba, who is sidelined with a back injury sustained at the World Cup, Arsenal’s defence has looked “particularly porous”. Jurriën Timber has also undergone surgery. The backline that was once a fortress is now leaking goals at an alarming rate.

Brighton’s first goal came from Pascal Groß finding space at the edge of the box. The second was a long-range strike from Charalampos Kostoulas. The third was a header from a corner. Three different types of goals, all preventable.

The fix: Saliba’s return can’t come soon enough. In the meantime, Arsenal need to simplify. The high line that works so well when everyone is fit becomes a liability when the personnel changes. Arteta may need to adjust his defensive approach until his first-choice defenders are available.

5. The Midfield Is Being Overrun

Declan Rice has been a revelation since joining Arsenal. But he’s also being asked to do too much.

The midfield that dominated games last season is now being “overloaded with minutes” and “overloaded with pressing opposition”. Bruno Guimarães was signed to add steel and quality, but his first league start was a disaster. Paul Merson described his performance as “a million miles off it”.

The midfield balance is off. Rice is at his best when he can press and drive forward, but he’s being asked to sit deeper and cover for full-backs who are pushing higher. Guimarães is still adjusting to Arsenal’s system. Ødegaard is creative but not physically dominant.

The fix: Arteta needs to find a midfield combination that works consistently, not just on paper. That might mean giving Myles Lewis-Skelly, who has been keeping Guimarães out of the strongest XI, more minutes. Or it might mean a tactical shift that gives Rice more freedom to do what he does best.

6. The Mental Fragility Hasn’t Been Fixed

This is the hardest thing to fix, and the most concerning.

Arteta sensed the problem before a ball was even kicked. “From the first throw you could sense it,” he said. The players knew what Brighton would do — they had watched the Seagulls dismantle Manchester United days earlier — and they still played into the hosts’ hands.

Arteta called it “disrespect” — a failure to respect the game, the opponent, and the principles that had made them champions. That’s a mentality issue, not a tactical one. And it’s the kind of thing that can derail a title defence.

The fix: This is where Arteta earns his money. The champions have lost their aura of invincibility. They need to rediscover the edge that made them so relentless last season — the hunger, the intensity, the refusal to be bullied. A week of reflection during the international break might help. Or it might not.

7. The Title Race Has Suddenly Become Real

Arsenal are second, behind Manchester City on goal difference. After five games. With City looking ominous and Liverpool not far behind.

The champions were never going to go unbeaten. Every title-winning team loses games. But the manner of this defeat matters. Brighton didn’t just beat Arsenal — they exposed every weakness that analysts had been quietly noting for weeks.

The international break gives Arteta time to reflect. It also gives his injured players time to recover. But it doesn’t change the fundamental issue: Arsenal’s squad, as currently constructed, has holes that elite opponents can exploit.

The fix: This isn’t a one-game fix. It’s a season-long project. Arteta needs to rotate more effectively, trust his squad players, and find tactical solutions for the problems that Brighton exposed. The title is still Arsenal’s to lose. But for the first time this season, it looks loseable.

Arsenal are still champions

. They still have one of the best squads in Europe. They still have Mikel Arteta, one of the most innovative coaches in the game.

But Brighton exposed something that no amount of possession or pressing can hide: this team, as it’s currently built, can be beaten. The forward line lacks bite. The defence lacks depth. The midfield lacks balance. And the mentality, on this evidence, lacks the ruthlessness that defined last season’s triumph.

Arteta called it “a big lesson”. The question is whether his players are willing to learn from it. If they are, this defeat will be a footnote. If they’re not, it will be the moment the title defence began to unravel.