Chelsea struggled to compete against Arsenal as the Blues fell to a 1-0 defeat against the Premier League leaders at Stamford Bridge.
Graham Potter's team selection was hampered by a number of injury issues with Kepa Arrizabalaga and Ben Chilwell both ruled out for the London derby. Arsenal returned to the summit of the English top-flight after Gabriel Magalhaes poked home a second-half winner from a Bukayo Saka corner.
Chelsea now sit seventh in the table, level on points with Potter's former side Brighton, with a Carabao Cup tie against Manchester City up next. Potter will be hoping he can turn things around at Stamford Bridge after his team have struggled in the past two Premier League fixtures.