Paris Saint-Germain players Neymar Jr, Angel Di Maria, Gianluigi Buffon and Thiago Silva, participated in a particularly special training session in the Inland Sea, one of the few places in the world where dunes meet the sea.
The Paris Saint-Germain striker's participation at the finals in Russia had been cast into doubt after he suffered a broken bone in his right foot in late February.
Paris Saint-Germain responded to reports from Brazil on Neymar's fitness by suggesting on Sunday that his recovery from injury would continue in France.
Edinson Cavani gave PSG an eighth-minute lead from the penalty spot after a lengthy delay for a video assistant referee review, before Angel Di Maria made it two and Cavani completed the scoring late on.
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.
Brazilian superstar Neymar will more than double his value inside two years, PSG president Nasser al-Khelaifi said on Friday.
Neymar is now free to complete his world record transfer to Paris Saint-Germain after Barcelona confirmed on Thursday his €222mn ($260mn) buyout clause had been received by the Catalan club.