Giroud bagged a brace as France prepared for the tournament with a 4-0 victory over Norway at the Stade de France on Tuesday evening.
"At the World Cup, everyone will be needed," the Arsenal attacker told French reporters following the victory.
"When I am called upon, I try to make the most of my chance and do the job.
"It's always good to win, including in friendlies. It's good for morale. Tonight, I really want to highlight the team effort. It was really good. Still, we'll stay measured, we still have to pass tests."
France begin their World Cup campaign with an opener against Honduras on June 15.