The National Union of Professional Footballers backed Neymar and also hit out at what it claims is a "spiteful" and "petty" complaint from Barcelona.
PSG head coach Unai Emery says Neymar has provided a positive boost to the team on and off the pitch.
PSG, who now boast Neymar, the world's most expensive footballer, in their ranks, will learn their Champions League group stage opponents on Thursday.
Serge Aurier is close to joining Tottenham and the club are also set to beat PSG to the signing of Estudiantes' Juan Foyth, a source has told ESPN FC.
PSG are yet to make a concrete offer for Kylian Mbappe despite both parties being interested in a move, a source close to the club has told ESPN FC.
Neymar is to fight a claim by Barcelona for compensation following his move to Paris Saint-Germain.