Aleksandar Mitrovic is Serbia's all-time top scorer, netting 50 goals in 76 international appearances
Neymar missed the 2014 semi-final with a back injury, and struggled for full fitness during the 2018 tournament after foot surgery earlier in the year.
However, he arrives in Qatar fully fit and having scored 15 goals in 20 games for Paris St-Germain this season.
"I think Neymar is coming into this competition in great form," said Silva.
"His preparation this time has been different. In 2014 he got injured just as he was playing so well, and in 2018 he came into the tournament in a different way because he had a serious injury so hadn't played much.
"Now with a different preparation, without any injury and any worry, we see a better Neymar."
Brazil head coach Tite has refused to say whether Lucas Paqueta will play instead of defensive midfielder Fred.
The Brazilian media have speculated that the Selecao will field a very attacking 4-1-4-1 formation.
Serbia are optimistic striker Aleksandar Mitrovic will be available to return following a foot injury.
Fellow forward Dusan Vlahovic made his comeback from a groin problem in a friendly against Bahrain and may partner Luka Jovic in attack.
-- Courtesy of BBC Sport