The Gunners put in an excellent display against League One side AFC Wimbledon at the Emirates Stadium.
Lacazette opened the scoring from the penalty spot, with Emile Smith Rowe and Eddie Nketiah adding gloss to the scoreline in the second half.
"Honestly I was surprised to see that many fans tonight for the game," Lacazette told the club's website.
"We are happy and we enjoy it when they are there.
"We missed them a lot during the pandemic so now that they are here, we have to give back the confidence that they give us.
"Honestly we want to go as far as we can in this competition, we want to win, in this kind of game we have to make it easy.
"I think we should do it earlier but at the end we have to say they (Wimbledon) played well but we are happy with our performance.
"All the players needed some minutes because obviously we don't have as many games this season so when we have a game like this we just want to perform well and enjoy it on the pitch together."
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