Chelsea fell to Atalanta on Matchday 5 of the regular phase, undone by a lifeless second half after a controlled and efficient start. The Blues gradually drifted out of the match, allowing the Italian side to overturn a game they had initially let slip.

- Atalanta 2-1 Chelsea : Scamacca 55’, De Ketelaere 82’ – Pedro 26’
In a fiery Gewiss Arena, Atalanta came out with intensity, pressing high and forcing Chelsea into backwards play and rushed clearances. Lining up in their big-match 4-3-3 structure, the Blues struggled early on but eventually managed to impose some control. Their patience paid off when Reece James, right on the edge of offside, delivered a pinpoint cross to João Pedro, who scored his first Champions League goal. Clinical, Chelsea reached halftime ahead despite Atalanta’s energetic efforts.
But everything unraveled after the break. Enzo Maresca substituted Chalobah — booked in the first half — for Fofana, disrupting a backline that had been functioning well. The tempo dropped, Chelsea lost all edge, and Atalanta took full advantage. Scamacca leveled the score on a poorly defended cross, the perfect illustration of how destabilized the London defense had become. The introductions of Gusto and Garnacho only added confusion, with Gusto placed awkwardly in midfield, a role ill-suited to him. Chelsea created nothing.
In the midst of this tactical disarray, the inevitable happened: Atalanta struck again, scoring the winner against a passive and disorganized Chelsea side.
By disrupting his team’s structure and rhythm, Enzo Maresca paid the price for abandoning football’s basic principles.