There were no answers to Chelsea’s search for consistency here. Instead they supplied more evidence that they lack the resilience for a Champions League tilt that may now have to be tackled the hard way. This damaging late defeat completed a grim week on the road and had implications for the longer-term picture. They are staring down the barrel of a February playoff that could stretch Enzo Maresca’s side, active almost year-round, to the very limit.

Atalanta twice punished weak defending and, crucially, preyed on their opponents’ inability to overcome setbacks. It is a problem Chelsea cannot quite shrug off and, at this level, such recidivism comes at a cost. When Charles De Ketelaere, the game’s outstanding player, blasted in a deflected winner after being invited to take aim they could hardly claim not to have been warned.