Les Bleus went down 1-0 in Montevideo thanks to a classy Luis Suarez goal, and the Arsenal striker believes that his side needs to show a similar cutting edge against Brazil.
Didier Deschamps' men were without the services of injured Real Madrid striker Karim Benzema, and their lack of threat in his absence was pinpointed as the key to their downfall by the Arsenal forward.
"It's never nice to start with a defeat, but it's not all bad," Giroud told reporters. "In the first half we created chances. We were let down by a lack of cutting edge.
"Personally, I felt we could have won this game in the first half. They took their chance in the second half."
The match was won by a clinical finish by Liverpool striker Luis Suarez, who scored within five minutes of entering the field as a halftime substitute. Giroud believes that he and his compatriots will have to take a page out of the Uruguayans' book if they are to secure a positive result against Brazil on Sunday.
"Suarez's quality is well known and if you leave him a little space, it's all over," Giroud said. "We were taught a lesson in finishing tonight [Wednesday]. We must learn from our mistakes and hopefully we will have a more positive result against Brazil."
Fellow Arsenal player Bacary Sagna was not so positive, as he felt tactical flaws in the side's build-up play prevented them from creating enough opportunities in Montevideo.
"I tried to get forward when I could," the right-back told reporters. "The problem was when the play went to the left and the attackers were attracted towards the center, meaning I had no one in front of me.
"From there, when I had the ball, I did not really have any options. The main thing was not to lose the ball."