Even if the race goes to the final weekend, a three-point lead with two games to play and the title race being in Lille's hands represents a phenomenal achievement.
PSG have won seven of the past eight top-flight titles in France, but Eder has observed a competition reborn this season – something he feels would be validated by Lille completing an unlikely march to glory.
"I think it's amazing for the championship because a lot of people have been saying that the French championship is PSG and no others," he told Stats Perform.
"I think that a lot of people, a lot of teams this year have been proving that they are there to compete with PSG, like Lyon and Monaco. They are having a great season.
"Lille have been doing amazingly well and I think that this is going to be something huge for French football."
Eder represented Lille between 2016 and 2018, a span that took in his undoubted career highlight – a goalscoring turn off the bench to snatch a 1-0 extra time victory for Portugal over hosts France in the final of Euro 2016.
The Portuguese link at Lille remains strong, with veteran centre-back Jose Fonte and playmaker Renato Sanches team-mates of Eder's in Fernando Santos' Euro 2016 squad.
Fonte and Sanches are joined by countrymen Tiago Djalo and Xeka in Galtier's side.
"We have groups of chats, and we are always cheering for Jose Fonte," Eder added. "We have our fingers crossed and we hope that he is going to win."
Fonte has played 35 of Lille's 36 Ligue 1 games this season.
Of defenders to have played more than 20 times in the division, none can better the 37-year-old's 68.7 per cent duel success rate.