The left-back, who signed from Schalke on a free transfer, has already made an impact, scoring Arsenal's equaliser as they went on to beat Chelsea on penalties in the Community Shield last Sunday.
Praising Giroud's response after being left out of the starting line-up, Wenger added: "I love the man and the player".
The Frenchman and fellow substitute Aaron Ramsay scored in the final seven minutes as Arsenal twice came from behind, the Welshman levelling two minutes before Giroud headed the decider.
The first game of the season already looks like a contender for game of the season.
Alexandre Lacazette heads in the opening goal of the season.
GOAL! Lacazette heads Arsenal in front after 94 seconds!
His name rang out, familiarly to the tune of Hey Jude, and Wenger snapped at the suggestion that he might still leave the club before the transfer deadline passes later this month.
Teenager Shapovalov stuns Nadal in Montreal
Nadal opens in Montreal against either Croatia's Borna Coric or Russian Mikhail Youzhny. "Obviously (it) is a tough lose for me". It will be an all-lefty battle between him and Nadal, and with the crowd behind Shapovalov , who knows what's going to happen .
And Holocaust Survivor - Dies At 114
According to Israeli news site Ynet, Kristal is survived by two children, nine grandchildren and 32 great-grandchildren. After the war, Kristal moved to Israel with his second wife, Batsheva, with whom he had a further two children.
Arsenal could be without several key players with Alexis Sanchez ruled out by injury and Laurent Koscielny suspended. But they were given a major boost, as Welbeck was able to level things up.
Leicester - not too far removed in their line-up from the team that won the title two years ago - might have gone into half time leading after Jamie Vardy snaffled Marc Albrighton's cross, but with the last kick of the half Danny Welbeck - another forward player in the competition for places - capitalised on Mesut Ozil and Kolisinac's unlocking of the Leicester defence for 2-2.
The striker, who the Gunners signed from Lyon for an initial fee of €53 million in the summer, finished clinically to put the hosts ahead after two minutes, expertly heading home Mohamed Elneny's cross.
Arsenal would hold on to secure an incredible victory in a magnificently entertaining season opener.
The visitors took the lead again 10 minutes into the second stanza as Vardy grabbed his brace with a cute header from close range. The home fans then endured the nervous wait for the late heroics, time largely passed by watching Alex Oxlade-Chamberlain fling hopeful shots at the goal.
"And you could see that this team has quality and is used to playing together, but [we had] 70 per cent possession with 27 shots on goal". Wenger names Dennis Bergkamp as perhaps the most skilled player he has ever worked with, before Mertesacker says he'd give Arsene Wenger a miniature World Cup trophy if he had to buy him a present.
"I'm happy the goals we conceded we can work on together".