Giroud came big for the Gunners once again.
Two minutes later, the comeback was complete, with super-sub Giroud sending the home fans wild via magnificent header from a Xhaka corner, despite being held by Wes Morgan.
"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".
West Ham, Everton and Marseille were all keen to sign the 30-year-old following the arrival of Lacazette from Lyon.More news: White House: Donald Trump and Emmanuel Macron on growing North Korea's threat
More news: Federer punches ticket to Montreal semis
More news: Markets Right Now: Stocks drift lower on Wall Street
"It is fantastic", Wenger replied when asked about Giroud's willingness to fight for his place. "Giroud in his prime is at the top of his game".
"For us it was a bit disappointing with the goals that we've let in and we shouldn't really be conceding in that way, but I think we showed great determination and great togetherness to get back into the game and we won it towards the end of the game".
"It's simple, in every game he is stronger since he joined us", Wenger said.
"It is a relief and I believe as well a reminder to the players that they have hurdles on the way and that we can get round it, like tonight so that is quite positive. Overall I must say we kept going and the spirit of the team was absolutely outstanding and overall you could say as well we were punished on every single mistake tonight by a Leicester team who was very efficient going forward", Wenger said after the win, as quoted on Arsenal's official site.
"You win 4-3, you're more happy than concerned, you know", he added.
"We were quite good a year ago on corners and I believe with a bit of work, we can get that out of the system".