Giroud had scored 12 Premier League goals in just 11 starts last season, but Lacazette was selected for Arsenal's opener and netted inside two minutes.
I am not trying to say that the Arsenal defence was not an issue as the Gunners scraped over the line to win the first game of the new Premier League season, because it most certainly was.
"They were hard moments when we were 2-3 down but we managed to get out of that and found two goals, which was great to see".
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.
Arsenal's foot-shooting continued when, despite creating numerous chances, they conceded at the other end, with Jamie Vardy showing all his finishing prowess to give Leicester the lead a minute before the half hour. "He is a collective player, an intelligent player as well".
Wenger insisted matches like this incredible curtain raiser are what helps the top level of English to be the world's most entertaining league - but it was Giroud that he saved his most fulsome praise for.
"To be honest, there was something in my soul and in my heart which told me to stay", he said. It's no doubt going to spoil all of us because the rest of the games are going to suck by comparison.
A insane game sees Arsenal winning 4-3 over Leicester City.
The north London side will be aiming to improve on their disappointing fifth-placed finish in the Premier League from last season.
"The goals we conceded, we can work to get rid of that".
"I think when teams make substitutions from the corners, it can cause a bit of confusion. He came here tonight and got the goals his performance deserved". I got back late, I should have handled this better.