Chelsea suffered a damaging 3-1 defeat by Brighton on Saturday to continue their indifferent start to the season.
Despite being faced with multiple absentees, the Blues had begun the game positively and Enzo Fernandez put them in front in the first half.
However, disaster struck when Trevoh Chalobah was dismissed early in the second period and Danny Welbeck equalised for the Seagulls on 77 minutes.
Things went from bad to worse for the Blues as Maxim De Cuyper looked to have scored the winner in added time, before Welbeck added another even later to put pressure on Enzo Maresca.