Antonio Conte was supposed to be the man to bring back Chelsea's defensive resolve.
On the evidence of Chelsea's 3-0 defeat at the Emirates Stadium on Saturday the Italian has a very big job on his hands.
The Blues produced one of the most frantic defensive displays since owner Roman Abramovich took charge of the club over a decade ago and left Twitter wondering whether Arsenal were that good, or Chelsea that bad.
Chelsea gifted the first goal when Gary Cahill woefully under-hit a backpass that allowed Alexis Sanchez to race through on goal and the shell-shocked visitors never recovered as Arsenal pulled them apart at will.
It was a glorious 45 minutes for Arsenal fans especially as they had not scored against Chelsea in their previous six league games.
The Gunners more than made up for it as Theo Walcott grabbed a second before Sanchez teed up Mesut Ozil for a third to make it 15 games since Chelsea last kept a clean sheet.
Conte arrived at Stamford Bridge with a reputation for whipping a defence into shape - as he proved at Euro 2016 with Italy - but the Blues are yet to keep a clean sheet in his eight games in charge and the deadline-day return of David Luiz doesn't seem to have helped.
Luiz wasn't one of the first defenders Conte chased during a transfer window that proved frustrating in his bid to bolster the defence, and the side-effects of those failed deals were on full display, especially with captain John Terry sidelined.
But while Chelsea fans were lamenting the possibility of another long season ahead, the mood was significantly more upbeat in north London.