The pair, rivals in Ligue 1 and team-mates with the Selecao, are both in camp ahead of their final Qatar 2022 World Cup qualifiers against Chile and Bolivia.
Neymar has arrived on the back of a rough personal period at Parc des Princes, having been booed alongside Lionel Messi following the club's Champions League exit.
Reports from RMC Sport suggested the forward had breached discipline at the club by showing up to training in a state of inebriation.
But speaking in a pre-match press conference, Lyon attacking midfielder Paqueta has fired back at such claims, hailing his fellow Selecao star as a "great professional".
"It's a total lack of respect, to say or transmit information that is false," he stated. "Obviously, [Neymar] didn't comment on that, I believe it's a lie.
"People talk too much and it ends up affecting us a little in a way, it's difficult to filter all that. You can't believe what people say. I believe Neymar is a great professional.
"Neymar, above all, is a great person, a great professional, who has an incredible talent, without a doubt is our best player in the Brazilian team.
"Having him with us is a privilege, particularly me, when I have Neymar on my side, I feel much stronger, as do all my team-mates.
"I think he also feels the same, we motivate each other more, hug each other more and that makes us stronger."