Saturday's match against West Brom was supposed to be a routine one for Chelsea. They were unbeaten in 14 and had conceded just twice in that period. A match against Sam Allardyce's 19th-placed side wasn't supposed to create too much difficulty.
And they were 1-0 up after 27 minutes when Christian Pulisic scored his first goal under Tuchel. But it all went wrong two minutes later when Thiago Silva was sent off for a second bookable offence.
Given their recent form and their defensive record, you'd still expect 10 men to handle a West Brom side who had won just three games all season.