Arsenal put in a dominant display to return to winning ways as they saw off Brighton at the Emirates Stadium.
Brighton gave themselves a Europa League lifeline as Joao Pedro's late penalty completed a comeback from two goals down away to Marseille.
Chelsea manager Mauricio Pochettino praised his players' character after they beat Brighton in the Carabao Cup to end a three-game winless run.
Chelsea earned respite from their difficult start to the season as Nicolas Jackson's second-half goal gave them a 1-0 win against Brighton in the third round of the Carabao Cup.
Roberto De Zerbi congratulated his Brighton players in the dressing room for their performance despite losing 3-2 to AEK Athens on their European debut.
Brighton head coach Roberto De Zerbi believes a first European tie can help give the club an "upgrade" – but warned it must not change their DNA.