Les Bleus went down 1-0 in Montevideo thanks to a classy Luis Suarez goal, and the Arsenal striker believes that his side need to show 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.
"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 half-time substitute.
Giroud believes that he and his compatriots will have to take a leaf 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," the 26-year-old continued.
"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 centre, 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."