Sam Allardyce’s side sprung a major surprise in west London and the result means the Blues hopes of finishing in the top four now hang in the balance.
Here are three Chelsea players who need dropping in the aftermath of the result.
The Brazil international was undoubtedly world-class during his prime but the Samba star hasn’t looked the same player throughout his time in the capital.
His lack of pace is evident and that makes him a weak link at the back for Chelsea.
The Blues are already looking for replacements for the former PSG captain, with Bayern Munich pair David Alaba and Niklas Sule under consideration.
Jorginho is too slow and lacks the energy required to be one of the best midfielders on the planet.
N’bolo Kante, when fully fit, should dislodge the Italy international from Tuchel’s side.
The Germany international has failed to live up to expectations at Stamford Bridge ever since his blockbuster move from RB Leipzig back in the summer.
And Werner failed to register a single shot on target as the Baggies caused a major upset.
Chelsea look far better when either Tammy Abraham or Olivier Giroud leads the line.
This article was most recently revised and updated 2 years ago