Argentine striker, Mauro Zarate, gave West Ham the lead in the 17th minute at Upton Park. The ball broke to the edge of the box following a corner, and Zarate drove into the corner past Asmir Begovic.
Kurt Zouma’s header appeared to have crossed the line for an equalizer in the 35th minute but goal-line technology showed that part of the ball was still on the line.
Things got worse for Chelsea in the 44th minute as Nemanja Matic was sent off for a second bookable offence.
Chelsea coach Louro reacted angrily to Matic’s sending off and was subsequently sent to the stands as well.
Words later filtered to match commentators after Mourinho failed to retake his position at the pitch side that the Portuguese had been sent off too.
Nonetheless, 10-man Chelsea showed character to get a deserved equalizer in the 56th minute after Zouma and Cahill challenged for Willian’s corner, the ball falling kindly for Cahill to send home.
However, Andy Carroll emerged from the bench to powerfully head in Aaron Cresswell’s cross with 10 minutes left to inflict another damaging defeat on Mourinho and the Blues.
The defeat becomes Chelsea’s fifth of the Premier League season as pressure continues to mount on Jose Mourinho.