Thomas Tuchel was forced into a last-minute change ahead of Chelsea's second-half against West Brom, when Christian Pulisic immediately pulled up with an injury during the warm-up.
The German manager suffered his first Premier League defeat with the Blues who were left stunned after a 5-2 loss to West Brom.
With Chelsea down 2-1 at half-time, Tuchel had planned to replace Timo Werner with Mason Mount.



However, as Pulisic ran out for the second-half warm-up, he pulled up after ten yards while running to the first cone.