Aston Villa secured a convincing 2-0 win over Chelsea in the Premier League on Saturday, thanks to goals from Ollie Watkins and John McGinn.
Chelsea's manager Graham Potter has been enjoying some spells without pressure but the lost will now return him to his previous state.
Watkins took advantage of a mistake from Chelsea defender Marc Cucurella to score in the 18th minute, while McGinn struck a stunning shot from 20 meters out in the 56th minute.
Despite enjoying 69% possession and having more than two dozen shots, Chelsea couldn't find a way past Villa's solid defence, with goalkeeper Emiliano Martinez making some important saves.
The defeat sees Chelsea drop into the bottom half of the table, while Villa leapfrog them into ninth place.