The hosts' defense looked vulnerable and Leicester got stronger and grew more confident as the match approached half-time.
However, there was one more twist in the tale as Olivier Giroud came off the bench to snatch a victor in the 86th minute as his header from a late corner came off the bar and dropped over the line to secure Arsenal a dramatic 4-3 win.
"You know, I must say I opened the door for him at some stage because I know that it's important for him to play".
Intriguingly, it is a former Arsenal forward with whom Lacazette now shares his record.
ARSENAL'S ALEXANDRE LACAZETTE got his Premier League career off to the flawless start against Leicester at the Emirates this evening. It was one of the great days for me in recent weeks [when he said he would stay]. Because I know how important he is, not only as a player - he is a fantastic player - but as well in the group.
"The first goal is on a short corner, we were not focused enough".
Craig Shakespeare's side boasted numerous players, and characteristics, that saw them shock the world to win the title in 2015/16.
Having seen Zlatan Ibrahimovic make a seemingly seamless transition from Ligue 1 to the more physical Premier League last season, the experienced coach expressed optimism that Lacazette would follow suit. "It was relief he chose to stay". We're disappointed to score three and come away with a defeat.
Arsenal are now unbeaten in 22 Premier League games against Leicester City - winning 15 and drawing seven - and they have won 11 successive Premier League home games against the Foxes.
"When you are not completely in or the players feel you are not completely in, it is hard to tell them we go (out to win)". 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.