Carlos Velasco will oversee tonight's last-eight encounter in Fortaleza, and Pekerman is confident that the Spaniard will produce an impartial performance.
"In terms of the referee I always have the hope of he has good performance," he told FIFA.com ahead of the contest.
"I don't have any suspicion and I don't think he will have any influence in the game.
"We know that there are mistakes in football from players, managers or referees but we trust in the good faith or credibility because all of them try to do their best."
The match is scheduled to kick off at 9pm.