Brazil fitness coach Paulo Paixao says Neymar has improved since moving to Barcelona.
Neymar missed the final weeks of the season with a foot injury.
But Paixao said: "Neymar continues to give us confidence.
"He has not only improved physically, but also in terms of in experience by playing with Barcelona.
"Today he measures up against other players who are in Europe and has experienced a different type of marking, which gives us a lot of confidence that he can do even more at the World Cup."
