The French forward was at his best when he came on in the second half against a spirited Crystal Palace side at the Emirates Stadium.
Lacazette netted a stoppage time equaliser for Arsenal in a 2-2 draw, which prompted reporters to ask Arteta if he was thinking of a way to get Lacazette to sign a new contract.
He said of the French striker, whose deal expires in the summer: "Well, we have him! He's our player, and he shows real commitment so
"I'm not thinking about anything. I'm thinking about how to get the best out of him, and tonight he showed a real big moment and how much he cares about the team."
Reports in the UK have suggested Lacazette is reluctant to sign a new contract with the Gunners.
He can agree a pre-contract agreement with foreign clubs once the winter window opens in January.
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