Neymar's physical fitness is developing at a faster pace than Brazil expected, with the World Cup less than a month away.
The Paris Saint-Germain forward has been out of action since February after breaking a bone in his foot.
Neymar's World Cup participation was initially in doubt but, despite missing the end of the season as PSG claimed a domestic treble, the former Selecao skipper should be fit for Russia.
At a news conference on Wednesday, Brazil fitness coach Fabio Mahseredjian suggested Neymar is ahead of schedule in his recovery.
"Neymar has been evolving very well," he said. "It is difficult to speak in percentages, we always want to improve more.
"We do not know where an excellent athlete can reach, but I can say that his evolution is above our expectations."