Celtic, as he fired a rocket up misfiring striker Jonathan David. The Ligue 1 side welcome Neil Lennon 's side on Thursday, having thrashed Sparta Prague in their Europa League group opener.
The are top of the league after seven games and Galtier is keen to keep their feet on the ground ahead of the European test.
He said: "We must maintain this level."I tell my players that the squad has quality, they have to be demanding of each other. "There won't be one squad for Ligue 1 and one for the Europa League, it will be done by the form of each other. "If the players read the media there's a lot of praise, so I have to be the safeguard that ensures my players want to be better game after game."It will take a lot of collective effort."Lille.
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