Deco knows all about Neymar, having faced the Santos ace several times since returning to Fluminense.
"I think Cristiano is like Messi. They are two amazing phenomena, each with his own style. Normal for the press to want to compare. They are far above the others," said Deco.
"I think there are three players who are at a level above the others: Neymar, Cristiano and Leo. Neymar is amazing with what he's doing in Brazil and will continue to be so when he goes to the La Liga.
"Neymar is at the level of Messi and Cristiano."