The Arsenal striker was left out of the Bleus' line-up for the win over Honduras and says he was upset with the coach's decision
A Karim Benzema double plus an own goal gave Didier Deschamps' side a convincing victory in Group E, with Giroud introduced in the 78th minute in place of Mathieu Valbuena.
But the Arsenal striker admits he was upset by Deschamps' decision to overlook him in his starting XI, despite playing some part in the match.
“Yes, it was a disappointment, I will not say otherwise,” he told L'Equipe. “But my little case does not come before the group. I am disappointed, but I respect the choices of the coach.”
However, Giroud insists he is “really happy” and believes the win could kick-start a major tilt at World Cup glory.
"It leaves a lot of energy. The time doesn't pass quickly, but I'm really happy,” he added.
“I hope it is the beginning of a beautiful story.”
France face Switzerland next, on June 20, before rounding off their group fixtures against Ecuador.