Arsenal legend Robert Pires has no doubts about the class of new strikers Olivier Giroud and Lukas Podolski.

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."