Luis Enrique's appointment as PSG coach was just as pivotal a moment in Vitinha's development.
Before the Spaniard took over from Christoph Galtier, Vitinha had quite a lot of "chores" at the Parc des Princes, as Lionel Messi, Neymar and Kylian Mbappe didn't do a lot of defensive work.
Vitinha maintains to this day that it was a privilege to play in the same side as three legitimate superstars - but he also admits that he much prefers the new PSG project, which focuses on younger players with something to prove.
There is certainly no room for slackers in Luis Enrique's line-up, while Vitinha is also a big fan of the coach's brutal honesty.
"The best thing about him is that he's very direct," Vitinha told The Times. "He will not lie to you. What he wants to say, he says. So you don't get the wrong impression with him.
"It's a very good thing for a player: you know what the coach thinks about you all the time. I like it a lot. Sometimes, coaches are not so direct, to protect themselves."
Unsurprisingly, Luis Enrique is just as enamoured with Vitinha, around whom he has built one of the most exciting and successful sides in Europe.
"Vitinha is unique," the former Barcelona boss says. "In possession, he is vital for us in his pivot role, he manages the ball perfectly, he does not lose it, and brings a lot to the team.
"He is strong physically, mentally, and he plays a difficult and complicated role in the PSG midfield. He embodies the perfect midfielder."