The Belgium international used the chip technique to score his side’s fifth spot-kick on Sunday, but it wasn’t enough to stop them losing 4-3.
The game was overshadowed by goalkeeper Kepa Arriazabalaga’s refusal to be substituted late in extra time, but Cascarino believes Hazard was guilty of not taking the game seriously enough.
“There is a complete lack of leadership at Chelsea, from the top down,” he wrote in The Times.
“There are no leaders in the boardroom, no leaders in the dugout and certainly no leaders on the pitch. Nobody seems to have a clue what is going on and Kepa Arrizabalaga’s refusal to be substituted at Wembley typified that.
“Eden Hazard is by no means captain material but he should be one of the senior players leading by example. Instead he was taking the mickey with his Panenka penalty in the shoot-out against Manchester City.
“It was bordering on ridiculous. There should have been someone in the dressing room after that saying, “What the f*** are you doing?”
"Would he do that in a World Cup final? No chance. He was not taking it seriously and it was completely unprofessional.
"It summed up what is wrong at Chelsea. Players such as Hazard and Arrizabalaga are pushing boundaries because they know they can get away with it — and Maurizio Sarri’s uncertain future as head coach adds to their complacency.”
