The hosts' defense looked vulnerable and Leicester got stronger and grew more confident as the match approached half-time.
Well if you were a manager and you would be on the bench when you're 3-2 down with 20 minutes to go, and you win 4-3, you're more happy than concerned.
Both Lacazette and Giroud need strong seasons to make sure they are in the French party travelling to the World Cup in Russian Federation next summer.
On Olivier Giroud: "I love the man and the player".
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Wenger revealed after the win that he offered Giroud the chance to leave the club this summer, but that the striker opted to stay, much to the delight of the manager.
Shinji Okazaki cancelled out Lacazette's opener with a close-range header after Maguire had been left unmarked to nod Marc Albrighton's deep cross back across goal. He doesn't want to leave, but at some stage I opened the door for him because I had many strikers.
Lucas Perez will nearly certainly leave the club after just one season due to limited game time, while the injured Joel Campbell has not been listed with a squad number, after several loan adventures. Because I know how important he is, not only as a player - he is a fantastic player - but as well in the group.
It was striker's first shot for his new club and he now becomes just seventh Arsenal player to score on his debut. "We had 27 attempts and they had three on target and three goals, but it's something we have to work on". "We put ourselves in a commanding position and a few lapses in concentration have cost us", Vardy said after the game. We love him and in the end he made a decision to stay.
'For us it was a bit disappointing with the goals that we've let in and we shouldn't really be conceding in that way, but I think we showed great determination and great togetherness to get back into the game and we won it towards the end of the game. Leicester was heading for something it didn't even achieve in its astonishing 2015-16 title-winning campaign: a win at Arsenal.