Giroud scored the only goal of the game on the night.
Sarri said: "I'm pleased for him. He's a very important player for us, because he's a very, very useful player for the team.
"But I know very well strikers want to score. And so for his confidence, I think it's very important. But, I don't want him to be worried about scoring, because for us he's very important, very useful.
"I think the first target in this competition was to qualify and now the second target is to win our group, so I think we need one more point. It's very important because then we can talk again about this competition in February, when we will have another target."