But Arsenal made it 2-2 on the stroke of half-time, Lacazette pushing the ball to fellow debutant, Sead Kolasinac who squared for Danny Welbeck to tap in.
The Sun claims Arsenal believe a breakthrough has been made in the club's quest to tie Ozil down to a new £225k-a-week deal, with the World Cup victor reportedly giving the impression that he's ready to put pen to paper.
Giroud had been heavily linked with a £20million switch to Everton following Arsenal's club-record deal for Alexandre Lacazette.
The compilers of calendar of the Premier League never has wished, and sent him to open the season, Arsenal and Leicester. There was still plenty to do, but somehow Lacazette found the pace and the direction to plant a header into the bottom corner, with not even two minutes showing up yet on the clock. On Friday night, his goal was more befitting of his No. 9 shirt; it was also the type of goal for which Arsene Wenger probably thought he'd have to turn to substitute Giroud.
"Overall I must say we kept going and the spirit of the team was absolutely outstanding and overall you could say as well we were punished on every single mistake tonight by a Leicester team who was very efficient going forward".More news: OpenAI Bot Triumphant Playing Dota 2
Lacazette scores the season's opening goal.
It took as little time for Leicester to quell any growing home optimism from that, as Harry Maguire headed a Marc Albrighton cross back across goal for Shinji Okazaki to then nod in himself from just yards.
"They are not anxious about the money because they aren't the ones getting it".
The visitors took the lead again 10 minutes into the second stanza as Vardy grabbed his brace with a cute header from close range.
It meant Arsenal get over an old problem, for an invigorating new feeling - they just have to address a few other problems to make sure that feeling endures.
The Premier League's most expensive player of the summer, Lukaku, who moved from Everton to Manchester United for £75m is a striker that certainly has to be looked out for.