Former Brazil international Sylvinho has admitted that he was "worried" about Neymar before the World Cup began.
The Paris Saint-Germain forward, whose domestic season ended in February due to an ankle injury, recovered in time for the World Cup and scored his first goal in Brazil's 2-0 win over Costa Rica.
Sylvinho, who is part of the team's coaching staff, said that Neymar is "getting better" as the tournament progresses.
"He's a very important player, because he's one of the best in the world," the 44-year-old said. "We were worried about him a month ago, because we didn't know how Neymar would be in the national team — when a player like him is out for three-and-a-half months with an injury, it's very difficult.
"But he's unbelievable, a special player, he's getting fit and he can improve. He's a nice guy and an incredibly strong player.
"His mind is really clear and he's helping us a lot. He's getting better. We're expecting more, he's growing up in the competition and we hope to see a great Neymar."
Brazil's next game at the finals is a last-16 tie with Mexico on Monday evening.
Jonny Whitfield
