Kevin de Bruyne put us ahead before Bukayo Saka levelled for the hosts from the penalty spot before the interval.
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Grealish and Erling Haaland found the net in the clincial second-hald display to secure three points and propel us to the top of the league table on goal difference.
Grealish revealed that the dressing room was vibrant after the victory.
“Obviously, everyone is buzzing in there as you can imagine, it’s a great dressing room to be in,” he said.
“If you want to win championships, that’s what you’ve got to do.
“You’ve got to come to places like this, when you’re not at your best and come away with three points. Everyone is over the moon.
“It does [feel like a statement]. It’s taken us a while to get there.
“We’re not going to take our foot off the gas or anything.”
The winger also spoke about De Bruyne‘s sublime goal and touched on the tactical tweaks that saw City emerge victorious in London.
Watch the entire interview via the video at the top of the page.