The France striker scored his sixth goal in 10 appearances this season with a close-range finish after exchanging passes with Ozil in the 15th minute. Arsenal were already a goal to the good thanks to Ozil's brilliant finish from Aaron Ramsey's pass.
"Mesut was unbelievable tonight, as usual," said Giroud afterwards. "It is really simple to find him on the pitch and we have a really good understanding on the pitch. He assisted on my goal and he always does the right thing in the right moment.
This is his fifth assist since he joined us and I think he was the man we needed to really improve ourselves
"This is his fifth assist since he joined us and I think he was the man we needed to really improve ourselves. He has incredible technique and he did very well tonight. His goal is quite difficult to score because he was far [from the goal], he had really good precision in his shot.
"I have the same [understanding] with Jack and Tomas and Aaron and Theo as well so I'm really pleased to play with these kinds of players."
Giroud has made a step up this year, carrying his prolific pre-season form into the new campaign.
"From the start of the season I have more confidence and I am settled well now in the team and in my new English life," he said. "I feel really good on the pitch and I want to improve myself.
"It's true [that I improve in my second season], because in Montpellier I really improved myself for the second season and I finished top scorer and we won the league. I agree with him [Arsène Wenger] and I want to show I can learn from my first season and improve myself here."Copyright 2016 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source