The three other teams in Group A, Croatia, Mexico and Cameroon, have been scouted and analysed for strengths and weaknesses.
All four Group B teams Australia, Chile, the Netherlands and Spain, one of whom could meet Brazil in the second round, have also been scouted by the team's two main scouts Alexandre Gallo and Roque Junior.
Potential quarter-final and semi-final opponents have also been analysed.
"Sixteen teams have been totally watched and scouted," Parreira told reporters on Monday as Brazil's players gathered for their first day of training at their base at the Granja Comary, 100 kilometres from Rio and where the team will remain for the duration of the June 12-July 13 tournament.
Brazil begin the World Cup against Croatia in Sao Paulo on June 12 and Parreira said he was confident the home side would leave the Maracana a month later with the trophy.
"The champions have arrived," Parreira said shortly after the first players arrived at the camp.
"I trust these players," he said. "We have the most expensive centre backs in the world. We have a brilliant team.
"We are favourites, of course, we are obliged to win, (but) being favourites isn't enough, we have to be serious and win on the field."
(Reporting by Rodrigo Viga Gaier and Pedro Fonseca; Writing by Andrew Downie; Editing by Greg Stutchbury)
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