Such an effort provoked scenes of sheer jubilation at the Emirates Stadium and came just two minutes after fellow substitute Aaron Ramsey looked to have rescued a point for the inconsistent Gunners after blasting in from close range.
The Premier League season started in incredible fashion, with two goals in a matter of minutes after the opening whistle. I keep the faith and I still believe I can have an important part to play this season in the club.
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Manager Arsene Wenger this week revealed that he gave the player the option of leaving, but that he chose to fight for his place. "Giroud in his prime is at the top of his game". He doesn't want to leave and I'm happy that he wants to stay.
"We have got a tough first run but we now can take a lot of confidence from this game, knowing we can go to the big teams and put on a performance and hopefully in the coming games we get that bit of luck and turn the positive performance into good points". "So overall I think he adapts slowly to the way we want to play and is a collective player and an intelligent player as well".
"It's simple, in every game he is stronger since he joined us", Wenger said.
"I feel as well that the goals we conceded, we can work together to get rid of that because one was a ball we lost in the build-up and we conceded two goals on corners".