Neymar was unveiled as a Paris Saint-Germain player on Friday following his sensational world record transfer saying he had left Barcelona not for money but a "bigger challenge" in France.
The 25-year-old Brazilian superstar flew into Le Bourget airport, north-east of Paris, in a private jet on Friday morning before heading into the city in a motorcade.
He was presented to the international media at PSG's Parc des Princes stadium just after 1:30pm (1130 GMT) in his first public appearance since buying out his contract at Barcelona for a world-record 222 million euros ($264 million) on Thursday.
"I want something bigger, a greater challenge. I am here to give my best and help the club win titles," said Neymar, who has signed a five-year contract with the Qatar-owned club expected to be worth 30 million euros net per year.
He insisted he had come to France "for the ambition of the club, which is very similar to mine."
But Neymar admitted that leaving Barcelona, where he formed part of a lethal attacking trio with Lionel Messi and Luis Suarez, was not a decision he took lightly.
"It was one of my most difficult decisions. In Barcelona I had adapted well to the city and the team. I had friends there and it has not been easy," he said.
"It was a tense time, thinking about what I should do in my life. I have left behind a lot of friends, but things go very fast in football."
Neymar will be presented to the PSG support on Saturday prior to his new team's first game of the Ligue 1 season against promoted Amiens.
A ceremony will begin from 3:45pm (1345 GMT) with the kick-off put back quarter of an hour to 5:15pm to allow extra time for the player's unveiling before an expected sell-out crowd of more than 45,000.
Neymar got a taste of what is to come when he stepped outside the Parc des Princes on Friday in his new team's kit, to be greeted by hundreds of ecstatic supporters.