Even Chelsea assistant coach and club legend Gianfranco Zola was left awestruck by the 27-year-old's display, bowing down as Hazard took his place on the bench having earned a deserved breather.
A fifth victory from five matches this season took Chelsea top of the Premier League table.
Chelsea manager, Maurizio Sarri, on Saturday made record in Chelsea's 4-1 victory against Cardiff City in the Premier League fixture at Stamford Bridge. "When Alvaro was playing it is completely different, he's a different player with different qualities, and it's good to have two good strikers in the team".
"When I arrived I thought that Hazard was one of the best players in Europe". If he wants to play for another season, I think it's right that he tried to play.
"I think he can spend less energy than now, ' he said".
But Sarri, whose Chelsea side have defied expectations and could be a surprise challenger for the title come May, believes it's still only City and Liverpool who will be fighting for the top prize. "So his actions, it shows he spends a lot of energies, and can have more energy in the last 25 metres. At the moment, in my opinion, Liverpool and Man city are better than us".
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Pep Guardiola had said his team would get fully up to speed after the global break and so they are. That's where I was brought up and I really hope he can have the same opportunities as I've had.
"I think in this moment, we are very risky in the offensive phase but we are not so solid as I want in the defensive phase", Sarri said.
Giroud has locked down his place in the starting XI for Chelsea, despite Álvaro Morata starting the season up front.
Sarri also affirmed that Hazard is capable of scoring 30-35 goals in a season.
"My target is to be the best team in England, but not in one month - maybe one season, maybe a little more".
"The doctor said we need to check in a couple of days and see how he's going on".