The London Stadium's first major test collapsed into near-chaos. West Ham's 2-1 win over Chelsea in the EFL Cup on Wednesday saw Slaven Bilic's team put in their best performance at their new home and yet the club was left defending a night of ugly crowd scenes -- with seven arrests made so far and a Football Association investigation launched.
Without the outbreak of violence that took place in the Sir Trevor Brooking Stand as Chelsea fans made for the exit just before full-time, the evening might well have been depicted as one of mere teething troubles, from which lessons might be learned.