Some Invasion! strips has been translated as backup stories in newsstand pocket comics by Mon Journal.
The firts dedicated translation to the world of Invasion!/Savage has seen the light of day in June 2015 in the form of a hardcover reprint of 2007 Rebellion Savage Taking Liberties. We can reasonably thank here the success of The walking Dead in France to understand why delcourt has chosen to published this first volume, the only one drawn by Charlie Adlard. Indeed, there is no mention anywhere in this edition as to this volume being the first of an ongoing series.