Pires, who became an Arsenal legend during his six years with the club, insists that there is no need for alarm.
He told the Sunday Mirror: "It takes time to adapt. And that's especially hard for the attacking players.
"It was four months before I felt comfortable playing in the Premier League in England.
"My first introduction to football in England was [landing on] the grass on the pitch! The game was so much quicker and more physical than I was used to in France.
"It is not easy and you have to adapt. It will be so much faster than the game Giroud and Podolski are used to.
"Not only do you need to become stronger physically, you have to be mentally stronger too. It's very demanding."