The 27-year-old is having to prove himself all over again at Emirates Stadium under new boss Unai Emery.
He was acquired last summer by Arsene Wenger, with a long-serving manager in north London having finally landed a player he had been courting for some time.
Lacazette did deliver 17 goals during his debut campaign in England, but form and fitness issues disrupted a season which also saw Pierre-Emerick Aubameyang edge ahead of him in the pecking order following a January arrival from Borussia Dortmund.
Emery is yet to decide how best to utilise his attacking options in 2018-19, but did see Lacazette shine off the bench in a 3-1 victory over West Ham on Saturday.
The former Lyon frontman told reporters after helping to inspire a come-from-behind success on derby day: “I knew I could help the team.
“What I do is different to everyone else. I just want to play and help my team all the time.
“When you come off the bench you have to be ready for your team-mates, it is what I tried to do and obviously it helped us to get the win.”
Lacazette is pleased to have played his part, with the Gunners still coming to terms with a change in approach after 22 years under Wenger’s guidance.
He added on what Emery is looking for from him and the rest of his team-mates: “The manager just told me to play my game and said we will win if I play well.
“There is a lot of difference under the new manager.