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The Irish top the group and Gallas knows next Wednesday's game at Lansdowne Road is particularly important to their hopes of reaching Germany next summer.
He said: "Winning in Ireland is perfectly possible, even if we will probably suffer for 90 minutes. But I am confident we can do it.
"On the other hand it would not be such a great achievement to win there. As I said we will suffer, but we'll do it."
France coach Raymond Domenech is a fan of Ireland's combative style and is
wary of not getting into a physical scrap.
He said: "We should not reduce the Irish game to a physical game. The Irish are obviously big strong guys but they also have a good game and quality."
"We will not be able to make any mistakes in these two qualifiers. We are in a cup situation, the matches we are about to play are must-wins and that's exciting. The prime objective is to win them all. In two months' time we will know."