The Red Devils have been on the coattails of the Brazilian, with recent reports suggesting Louis van Gaal would be prepared to activate the striker's £140million release clause.
But the Daily Mail reported Barcelona are set to hold talks over a new five-year deal for Neymar.
And with that, it is believed they will raise his buyout clause to a whopping £182m.
Though former Barcelona star Belletti thinks Neymar is 'happy' at the Nou Camp, he admits anything could happen.
"No I don't think so, Neymar is very happy in Barcelona," Belletti told Omnisport.
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Manchester United are keen on Neymar
"He has adapted to the team, the city and his family have adapted as well but nothing is impossible."
Barca meanwhile were drawn with Bayer Leverkusen, Roma and BATE Borisov in the Champions League group stages.
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