United held talks with Moura's club Sao Paulo but were unable to agree terms, leaving big-spending PSG to become favourites to sign the teenager after Inter Milan pulled out of the running.
Reports had also suggested Sir Alex Ferguson's side were not willing to meet the demands of Moura's agent and the midfielder has now admitted talks are underway with the Ligue 1 side.
Moura is expected to leave Sao Paulo in January in order to link up with compatriots Thiago Silva and Leonardo, the French club's sporting director.
The 19-year-old told Folha: "This is a good thing. I'll stay at Sao Paulo until the end of the year. Things are well underway."
He added to Globo Esporte: "No doubt that would be better because I can help Sao Paulo a bit more. I have always said I want to win a title before leaving and qualify for the Libertadores Cup.
"If it happens in January, I'll be able to do that for Sao Paulo.
"I'm focused on the national team. I can only say something after the Olympics. It's well underway, but not done.
"I talked to Thiago Silva and Leonardo, they said many good things about the club, the project they are implementing there."
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