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Lacazette, who joined the Gunners from Lyon this summer, scored as Arsenal were beaten 2-1 by Sevilla at Emirates Stadium on Sunday.
“For a striker it’s vital,” Wenger, who saw his side lift the Emirates Cup despite defeat, told arsenal.com.
“I think he has shown some good things. He was not involved a lot because we didn’t have a lot the ball [against Sevilla], like we’re used to having, and the strikers suffer from that. Overall, what he has done is good.
“It’s his strength. He has a very strong record in scoring goals and that comes from the fact that he is in the right positions in the box and anticipates well. Overall, that is a very important quality that will be needed throughout the season.”
Lacazette will hope to make his PL debut when Arsenal host Leicester City on Friday 11 August.