In just his second season as a professional (he made just 2 starts in his first season), the prodigious youngster racked up 21 goals and 8 assists between the league and Champions League (23 starts).
Prior to his move to the Parc des Princes, Mbappe was being tracked by a number of Europe's top clubs, with all of Arsenal, Liverpool, Real Madrid, Barcelona and Manchester City having been linked with moves for the prodigious teenager.
However, as per the aforementioned interview with Ralph Rangnick, Mbappe's future could very easily have laid in the Bundesliga, had the RB Leipzig chief made one promise to the youngster's father.
"We nearly signed Mbappe", Rangnick told German newspaper Bild.
"The problem was: at the time we had just parted company with (coach) Alexander Zorniger, that was just after the winter break in 2015". At that moment we didn't know who would become our coach and how it would continue.
Rangnick added that Mbappe's father told him if he could assure him, "that I would be coach, that he would entrust me with the boy immediately. But I couldn't give him that promise already in February ".
Mbappe, meanwhile, is now part of the world's most expensive front three at PSG - with £198m world-record buy Neymar and Uruguayan Edinson Cavani. His replacement Ralph Hasenhuttl led the team to Champions League qualification last season.