The two sides meet again on Tuesday in a crucial English Premier League (EPL) date at Stamford Bridge.
Thomas Tuchel’s Chelsea has beaten Manchester City 1-0 in the semifinal of the English FA Cup just a few weeks ago.
Chelsea manager Thomas Tuchel has now defeated Pep Guardiola for the first time in his career.
Saturday’s defeat could see Chelsea drop to 5th on the EPL table with 51 points should West Ham win its next match.
Manchester United will likely feel hard done by, as Callum Hudson-Odoi appearing to have handled the ball in the box escaped unpunished.
German manager Tuchel took over from the sacked former Blues midfielder Frank Lampard on Tuesday after signing an 18-month contract.
