The world's most expensive footballer Neymar insists it was ambition and not the lure of riches that convinced him to swap Barcelona for Paris St Germain.

Brazil forward Neymar, 25, has signed a five-year deal with ambitious Ligue 1 club PSG after his legal representatives paid Barca £198m to release him from his contract at the Nou Camp.

Neymar, who won the Champions League and two LaLiga titles with Barca, will reportedly earn £27m net per year at PSG, or close to £540,000 each week after tax.

But the man hailed as "the best player in the world" by PSG president Nasser Al-Khelaifi at a press conference on Friday stressed his desire to help the French team achieve their dream of European glory was his guiding influence.

He said: "I wanted a new challenge. This was about ambition. My heart told me that it was time to sign for Paris St Germain. It was the right time to leave Barcelona and find new challenges.