The 29-year-old Sevilla hit-man- who also wants to finish as the tournament's top scorer - said that it was pointless playing pretty football if they came away without the trophy.
"If it is necessary to play dirty to win, we will do it, what counts at the World Cup is to win," said Fabiano at Brazil's training camp. "I am at a stage where I want to achieve several goals. I have already achieved one which is to be here with the squad.
"Above all the most important target is to be crowned champions. To be leading scorer is a consequence of those efforts during the whole of the tournament," added Fabiano, who has formed a potent strike partnership with Robinho since 2007.
Brazil, who topped the South American qualifying group, are in Group G - the so-called 'group of death' - along with 2006 semi-finalists Portugal, Côte d'Ivoire and Korea DPR, who they play first up on 15 June.