Neymar joined PSG from Barca last August in a world-record €222million move but has strongly been linked with a move back to LaLiga.
And with the uncertain future surrounding Real Madrid stars Cristiano Ronald and Gareth Bale, the rumours of an off-season move has further intensified.
But the Brazil star has dampened speculation over a move to Los Blancos ahead of the upcoming 2018 FIFA World Cup.
"My focus is Brazil, people are talking nonsense and that is not worth answering," he told reporters, as quoted by ESPN.
In reference to his desire to work with Guardiola, the 26-year-old, who looks set to star with the Selecao in Russia next month admits he was disappointed when the Spaniard left the Blaugrana.
"I have always wanted to work with Guardiola. It's different, I arrived [at Barca] after he left.
"I really want to work with him."