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In his first start since January, Lacazette got on the scoresheet with a penalty and well taken left foot finish.
The France striker came off in the second half and Wenger admitted he 26-year-old was unhappy to be brought off.
He said: “He didn’t want to come off. He didn’t look fatigued, but Danny Welbeck can get us a goal, and there was no need to take a gamble.”
Henrikh Mkhitaryan also came off in the second half due to a knee problem and Wenger revealed the Armenian would miss Sunday’s clash with Southampton.
Wenger said: “Mkhitaryan has a knee problem, we don’t know how bad it is. He will certainly be out for Sunday.”