Nasri is a confirmed target for PSG chief Leonardo.
"I hope he will stay, even if he's endured a difficult season. When Samir is at the top, when he is good as he has been lately, he is one of the best players in his position in Europe," said Vieira.
"What is important is to build a team over time. Samir is a young player, a very good player and I hope he stays with us for a long time."