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Benzema entered the tournament as arguably the world's most complete forward while Giroud was a likely substitute in the France team.
Last month, Real Madrid star Benzema won the Ballon d'Or. Then his World Cup ended before it started when he tore a thigh muscle in training on Saturday.
With Benzema out of the tournament, Giroud is expected to move from the bench to a starting role against Australia on Wednesday morning (AEDT) in the Group D game. He has extra motivation to do well since he is just two goals shy of Thierry Henry's France record of 51 goals.
"For me, it's a gift to play in this World Cup, I'm treating it like a young player appearing in his first World Cup. It would be a bonus to beat Titi's (Henry's) record," Giroud said prior to Benzema's injury. "I'm very happy to be part of this adventure. It's a great source of pride."
The 36-year-old striker has looked sharp with AC Milan this season and his hunger is evident.
"I feel in good shape," he said. "I'm not setting myself any limits. My determination to stay at the highest level remains the same."
It's another swing in fortunes between Giroud and Benzema, and this time the pendulum has moved in Giroud's favour.
Last year, it was Benzema's unexpected recall that saw him take Giroud's long-standing starting place at the European Championship, where Benzema led Les Bleus with four goals.
Giroud's international career appeared to be on the demise when he was again overlooked by coach Didier Deschamps for Nations League games in June, even though he was doing well with AC Milan and helped the Italian club to the Serie A title.
Giroud's relationship with Deschamps was once strong. But it soured as Benzema's partnership with Kylian Mbappe flourished, each scoring when France won the Nations League last year and then scoring freely together in following games.
His back to the wall, Giroud did what he's always done: prove any doubters wrong. He had done that at Arsenal, helping the London club win three FA Cups. Same at Chelsea, leading the competition with nine goals when it won the Europa League in 2019; then playing a key role in Chelsea's Champions League success in 2021.
At Milan, he overcame hard-to-please fans who harshly compared him to club teammate Zlatan Ibrahimovic. Now those fans adore Giroud after he helped Milan win its first Serie A title in 11 years, scoring in big games and becoming a firm favourite at San Siro thanks to his work rate and unselfishness.
This season he's carried on, helping Milan return to the last 16 of the Champions League for the first time in nine years.
"You need to be decisive in your club and that's the case with Milan," Giroud said. "It's given me a lot of confidence."
How to watch Socceroos v France LIVE and FREE on SBS
Wednesday, November 23
Group D - France v Australia
5:00am - 8:30am (AEDT) - kickoff at 06.00am
LIVE on SBS and SBS On Demand