Neymar said: "The Premier League has many quality players but nobody has hit Ronaldo's level.
"You look at La Liga and they have Messi, Ronaldo, Falcao, Iniesta and many others.
"He is my friend but I don't speak as a friend when I say Oscar can go on to be a better player for the Premier League than Ronaldo was.
"His technical ability is as good as any player in the world and he can score some great goals.
"He is like Ronaldinho and Rivaldo, a magician on the ball - and even though he has had a good start with Chelsea you have not seen anything yet.
"His game is perfect and he has everything to become the best player in the world in the next two years."