By the way, the play off round will be 2 legs, at Juventus base and Nantes base.
The advantage is not only present when Juventus play their home matches, but even in away matches they are a club that greatly benefits from the status of hosts Nantes which cannot be said to be a club that is in good condition at all.
The meeting between Juventus vs Nantes will be their first meeting, I don't remember whether they have met in a match or not. On paper, who wouldn't make Juventus a clear favorite who clearly has very good strength compared to their current opponents.
Aside the advantages of playing on home turf and all, Nantes have been awful recently while Juventus seem to have gotten their form back and even have a shot at the league. To me, Juventus would win easily. In fact they'll win both legs of that tie. Nantes is no where near where Juventus is right now. If the match took place when Juventus where in a poor form then Nantes would have stood a chance but right now they're currently 15th on the league table. Their last win against Auxerre was their first win in 6 matches. I really don't see how their going to qualify ahead of Juventus in the Europa league.