Maurizio Sarri's tactical masterclass was undermined by the shameful actions of Chelsea's record signing Kepa Arrizabalaga, who refused to leave the pitch in the closing minutes of extra time in order to be substituted.
Willy Caballero was left waiting on the touchline by an act of rebellion from the £71 million goalkeeper, who didn't allow the penalty specialist on the field despite suffering from an injury to his hamstring.
With the scores level at 0-0, Sarri was left furious and had to be held back by Antonio Rudiger after the match such was his anger.