Mauricio Pochettino's side fought back to draw 2-2 in Turin and a low-scoring draw will be enough to reach the Champions League quarter-finals.
But Moura, who made his Spurs debut off the bench in the Allianz Stadium last month, said: “The 2-2 in the first leg was a good sign for us but it would be a mistake to approach the Wembley game looking to sit on that result.
"Juventus are a great team – one of the best in Europe. They have been finalists in two of the last three Champions League finals. They have the experience and the nerves to snatch qualification also in an away game like this.
“They are a very balanced team and know how to defend well and how to exploit the chances they manage to create. In the match in Torino, their start was explosive but then we managed to get the draw.
"But that evening has to sound a warning – Juventus are capable of scoring two goals in minutes."