We lost 3-0 at Brighton, our first defeat of the season, and it was thoroughly deserved. Pascal Gross, Charalampos Kostoulas and Chema Andres scored, the nine-game league winning run is over, and we go into the international break having been outplayed by a Brighton side who were sharper, hungrier and more coherent than us in every phase. There is no clever framing that rescues this one. We were second best, and the scoreline was fair.

This is our biggest league defeat as reigning champions since a 0-3 at Everton in October 1989, and it matches the 3-0 Brighton themselves handed us at the Emirates in May 2023. Those are not comfortable comparisons, and they should not be softened. The one caveat the numbers offer is that we actually edged the expected goals, 1.58 to Brighton's 1.33, but that is a statistic in search of a consolation. Anyone who watched this knows the better team won by a distance, and that the xG flatters a performance that lacked intensity, structure and any real threat until the game was long gone.

We were second best from the first whistle, barely able to get the ball out of our half in the opening half hour, and the breakthrough that had been coming arrived on 31 minutes. Pascal Gross, a familiar tormentor, pinged a shot in off the post from distance, a fine strike we did far too little to prevent. It set the tone, and worse followed on the stroke of half-time. Charalampos Kostoulas, the 19-year-old, had a look from 25 yards and did not hesitate, curling home a superb second that sent Brighton in two up and deservedly so.

Whatever Arteta said at the interval did not land. Twelve minutes after the restart the game was gone: Chema Andres rose to head home a corner, the kind of set-piece goal that has been an issue and looked wearily familiar to everyone in red. Raya complained of a foul in the build-up and the referee waved it away. At 3-0 the contest was over, and Brighton could have had a fourth, Yalcouye striking the woodwork and Raya making two saves as the hosts cruised to the line. Kai Havertz wasted our one presentable chance at the other end, which sums the afternoon up. We did not lose this to a moment of misfortune. We lost it to being comprehensively outperformed.

Because the warning signs of the last month were real, and Brighton were good enough to expose them fully. I have written across these reports that we were winning without controlling, needing an Odegaard strike, a Raya save, a Guimaraes moment to separate us from opponents who stayed in games. The individual brilliance covered a collective looseness, and against the Premier League's top scorers, on a day when no individual produced a rescue, the looseness was all that was left. Brighton won possession in the final third nine times, the most any side has managed against us in a league game since Liverpool in December 2023. That is not a blip. That is a team being pulled apart in the areas that decide matches.

The specific problems were the ones that have been building. The set-piece concession for the third is a recurring soft spot. The forward line, thinned by the summer sales of Martinelli and Trossard, offered almost nothing, and Gyokeres was again peripheral in a game that needed a focal point. Havertz missing our best chance continued a finishing problem that let Napoli off the hook and nearly cost us at Sunderland. When the goals are shared around by committee and the defence has an off day, there is no reliable source of rescue, and Saturday was the afternoon that truth arrived.

None of this is a crisis, and it should not be treated as one. We are five games in, we have thirteen points from a possible fifteen, and one bad afternoon against an excellent Brighton side does not undo a strong start. But it is a genuine warning, and pretending otherwise would be dishonest. The performance level across the winning run was not as convincing as the results, and here the performance and the result finally matched. Brighton were superb, motivated and clinical. We were flat, disjointed and short of ideas. Both things are true, and the second one is on us.

The international break has arrived at a useful moment. It gives Arteta two weeks to address what this exposed rather than a midweek scramble, and it takes some of the immediate sting out of a bad day. Leeds at home is next, and the response to that will tell us more about this side than the nine wins that preceded this defeat did. Champions are defined by how they react to afternoons like this. We were awful at the Amex. Now we find out what we do about it.