The 21 year-old is out of contract with French League Two side AS Nancy and is expected to be available for a fee of around £3 million.
Neil Lennon will be looking to add to his squad before the first round of Champions League qualifiers in July. Louis has been bee scouted by Celtic for several months however he is also on the radar of other European clubs including Monaco. Wolfsburg and Hoffenheim.
He has been in impressive form this season having scored 12 goals in 28 games which has put AS Nancy within touching distance of promotion and a return to the French top flight after being relegated last season.
Having joined AS Nancy from Le Mans in 2012 for £650,000 he has 13 caps for his country meaning he should have few problems in gaining a work permit.