Arsene Wenger's inspired changes paid dividends, though, as Ramsey levelled things up and then two minutes later Giroud turned the game completely on its head as Arsenal ended their opening-game hoodoo.
Lacazette, who became the club's record signing this summer after arriving from Lyon, starts up front with Alexis Sanchez still unavailable due to an abdominal strain. In the end he chose to stay and it was one of the great days of the recent weeks for me. It's fantastic Giroud wants to stay - he chose to stay.
"Obviously I knew that I was going to have a chance so we tried to push", Giroud said. "He's an intelligent player".
For Wenger though, he'll be breathing a sigh of relief.
Following a short corner on the left, Marc Albrighton's deep cross was headed back across goal by Harry Maguire and Okazaki leapt to nod a header past Petr Cech.
Before that though, Vardy stunned Arsene Wenger's men with two goals and Shinji Okazaki also went on the score sheet to nearly punished Arsenal which played without star forward Alexis Sanchez because of injury.
You've got a £50m budget to pick 11 players, with all the biggest new signings ready and raring to go ahead of a mouthwatering new Premier League campaign.
Vardy punished Arsenal for sloppy defending when he won a free header from Mahrez's corner to give Leicester the lead once again.
"We're gonna win the league!" sang the Leicester fans and they nearly had a third goal to cheer when Okazaki's header from Christian Fuchs's cross bounced just wide of Cech's left-hand post.
"I think we have all seen the amusing business of the transfer window and we never know what is round the corner. We were quite good previous year on corners and overall I believe that with a bit of work we can get that out of the system". "There were hard moments when we were down and we managed to get out of that and it's great to see".
Leicester manager Craig Shakespeare said he was "disappointed" that referee Mike Dean did not spot what he described as a "definite handball" by Mesut Ozil in the build-up to Ramsey's equaliser. "To come here and score three has to be pleasing in some respect, but it doesn't feel like it".
Late Welsh equalizers and meaty French foreheads somehow have Arsenal at the top of the league.
"It will be interesting to see how he interacts with Jamie Vardy". He can be a nuisance for defenders.
It was the ideal way to seal an enthralling game that had threatened to end in defeat for the home side.
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