The Ligue 1 champions posted a video of Neymar wearing a jersey with 2025 on the back and saying "Ici c'est Paris" - 'This is Paris' - a favourite chant of the fans.

What they and the club demand is the Champions League, a trophy PSG have never won despite spending a world record 222 million euros ($A344 million)) on Neymar when he joined from Barcelona four years ago.

"Of course, my goal when I came was to help get Paris St Germain to the top, among the very best, and we are getting close," Neymar said.

"We are gaining more and more experience to help us negotiate these types of games."

Neymar was largely ineffective when PSG lost last year's final 1-0 to Bayern Munich and made a limited impact when they were eliminated from the semifinals recently, losing both legs to Manchester City for an aggregate 4-1 loss.

"Paris are on the right track, we are getting closer and closer to the taste of winning the Champions League," he said. "I'm sure we can do it."

The 29-year-old would have been out of contract next June, along with striker Kylian Mbappe, who has yet to re-sign and has been linked with a move to Spanish giants Real Madrid.

"I'm really pleased to continue my adventure at Paris Saint-Germain. I'm very happy in Paris, and proud to be part of this squad," he said. "These are things that make me believe even more in this great project."

Neymar also said he wants to keep working with coach Mauricio Pochettino, who joined mid-season after now-Chelsea manager Thomas Tuchel was fired.

Neymar called the Argentine "a great coach who will certainly help us even more."

However, PSG are four points behind Lille in the French title race and face a difficult trip to Rennes on Sunday.

Neymar has scored 85 goals in 112 games since joining along with Mbappe, who joined for 180 million euros ($A279 million) from Monaco.

But Neymar hasn't delivered on the biggest stage so far, failing to score in seven straight knockout games of the Champions League, and his leadership has also been questioned.

Neymar lost his temper and berated a teammate in the home leg against City.

He also threw lavish birthday parties in February close to Champions League games and questions have been asked as to whether his persistent muscle injuries are linked to a lack of sufficient recovery.

"I have changed a lot. I have learned a lot. Things have happened that should not have happened," Neymar said. "We had fights, a few sad times, but overall, the evolution has been very positive."

Australian Associated Press