Giroud came off the bench with Arsenal trailing 3-2 in Friday's Premier League curtain-raiser at the Emirates Stadium and after fellow substitute Aaron Ramsey equalised, he headed in an 85th-minute victor.
The lead unfortunately wouldn't last long as Leicester City eventually equalized just two minutes later, but the memory is one that both Lacazette and Arsenal fans will hold onto, as their new boy provided plenty of promise for the coming season. Then Jamie Vardy's 29th minute goal put the visitors in front, but Danny Welbeck restored parity for the Gunners in the 45th minute.
Express Sport has had a go at predicting how each of the weekend's fixtures will play out - do you agree?
Arsenal's new signing Alexandre Lacazette took just 94 seconds to make his mark with a header from Mohamed Elneny's curling cross to equal the record for the fastest opening goal in a Premier League season. I know how important he is not only as a player - he's a fantastic player - but also in the group he has a big weight.More news: FLASHBACK: Obama Boasted the US Could Destroy North Korea
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"Maybe not (enough changes) to win the league, which ultimately is what they want to do", Neville said on Sky Sports.
"Leicester had three shots on target and scored three goals, so that shows you how efficient they were, but overall I must say if you look at that from a neutral point of view, for the first game it was a top-quality match".
"It's simple, in every game he is stronger since he joined us", Wenger said. At some stage, I opened the door for him because I knew that I had many strikers.
"You want the Premier League to be the best league in the world and I think it has to produce this kind of game to produce interest and quality. One was a corner, one on build-up, one on a corner again", he said. We were quite good a year ago on corners.