Giroud feels he is now ready to launch his career in Ligue 1, having returned to Montpellier this summer, but admits he could be preparing for a tilt at the SPL title had things worked out differently.
"In December, I spoke with Glasgow Celtic but a deal fell through," he told L'Equipe.
"They set a deadline because they were in a rush to try and catch up with Rangers, but I needed time to think about it.
"I have immediately felt that there is a good atmosphere inside the camp and I am confident I will adapt quickly. I believe the club is perfectly suited to me."