Luiz Felipe Scolari insists Brazil players must not sacrifice regular playing opportunities in favour of a lucrative deal this season, as the Selecao prepare for their home World Cup in 2014.
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A number of World Cup hopefuls, including Chelsea players Wallace and Lucas Piazon, have secured loan deals abroad to improve their chances of earning a place in Scolari's squad next year.
The former Portugal boss believes fringe players cannot afford to move to a club that cannot promise playing time, despite the significant money on offer.
"A player who wants to play for Brazil has to think about the national team and not just think about the monetary side," Scolari said. "The spirit we showed at the Confederations Cup was absolutely spectacular.
"But now it's over and we're on a new path. The athletes have to remember that a lot can happen - players not getting regular games, transfers, players, dropping out of favour at their clubs.
"The players know that nobody has made sure of their place. We played well (at the Confederations Cup), but they have to play at their clubs so they can be picked. Some players have credit in the bank, but credit can dry up and that is how it has to be."
One player of particular concern is goalkeeper Julio Cesar, who is currently seeking an exit from Championship side QPR, but has had talks with Serie A side Fiorentina fall through.
"I'm worried and he knows that," he added. "If possible, he needs to try and play, it doesn't matter if it's in the second division, third division or tenth division. I want to be able to see how they are playing and if they are in the right state."