Neymar is desperate to help Brazil – one of the favourites for the tournament – to their first World Cup title since 2002.
"What inspires me the most is playing football. Being inside the field is my greatest joy," he told Desimpedidos in a Facebook interview.
"The World Cup is the biggest championship in the world, I just want to play and be a champion. This cup has to be mine."
Having been sidelined since February, Neymar said he was slowly nearing a return.
"I've already started to train with the ball, I felt good, comfortable," he said.
Obrigado Deus... muito feliz de ter mais uma oportunidade de representar a minha nação!— Neymar Jr (@neymarjr) May 14, 2018
Partiu, Rússia !!!! pic.twitter.com/YNCStoMW7N
"Of course I had a little fear, but I'm slowly coming back."
Brazil and Neymar will also be looking to erase the taste of failure from the 2014 World Cup, when the side were throttled 7-1 by Germany in the semi-final on their home soil.