After nearly 30 minutes being a goal down, the Gunners look destined for an opening day defeat but their so often hero, Aaron Ramsey, who came on a second half substitute, drilled the ball past the goalkeeper after showing some excellent control.
And speaking after the game, the 30-year-old confirmed his intention to stay and fight for his place at Emirates Stadium.
"At one stage I opened the door for him as I knew I had many strikers, and in the end he made a decision to stay", Wenger told BBC. It was one of the great days for me in recent weeks [when he said he would stay].
"Not only as a player, he is a fantastic player, b ut as well in the group - he has a big weight in the squad and it was a relief for me that he chose to stay".
However, Wenger insists that Giroud will remain in north London beyond the end of the transfer window despite being given the opportunity to move on and seek more regular football elsewhere.
But Arsenal entered the match with a dismal record of one win, three losses and three draws in their last seven season openers.
The French global has been linked with an exit from the Emirates over the summer, and to the delight of Arsenal fans Marseille boss Rudi Garcia most recently revealed that they had ended their pursuit of the striker. We had some avoidable goals which we conceded and overall we have to work on that.
"Insecurity goes quickly through a team and we had many experienced defenders out tonight - Koscielny, Mustafi, Mertesacker". Arsenal were twice behind against Craig Shakespeare's side. "It's a long time since we had so much quality [in attack]".
"I'm always looking for the positives, we came to the Emirates and the players executed the game plan".
"For a first game, it was a top-quality game". Wenger would not discuss this evening who may be departing his bloated squad, but said players needed to play and that in some positions he had three or four players fighting for the same spot in the team.
"I felt that to lose tonight would have been bad for us because we had such good preparation and to sit there in the morning and think we had lost at home would have been awful", he said.