Coach Vicente del Bosque appears uneasy with Spain being considered one of the favourites to win the World Cup.
La Roja enter the tournament with pedigree, as they top the FIFA rankings, in addition to being the defending world and European champions.
Del Bosque, however, is wary of placing undue pressure on his charges as they prepare for their Group B opener against 2010 finalists Netherlands on Friday.
"It will be on the field where things will make themselves known. We believe we've worked hard to get things right but football is what, in the end, shows whether things have been done right or not,” Del Bosque told Marca.
“Everything that has happened to us in the last four years is down to the fact that we won [the 2010 World Cup].
"From the idea of being favourites, it is best to turn away, and it is my experience in football that tells me this. A World Cup final is far too big of an event to start sticking these kinds of labels on to.
“Obviously, Brazil are playing at home and are a great team; all the same, the pressure they are going to be under is huge, a lot more than in the Confederations Cup.”