Japan goalkeeper Seigo Narazaki and central defender Marcus Tulio Tanaka have joined a growing number of players putting the boot in on the new World Cup ball.
"I tried to get used to it in Japan but I have realized since coming here (at Japan's high altitude training camp) that has been a waste of time," Narazaki said of the Adidas "Jabulani" ball.
"Maybe they should stop trying to keep developing the ball and just change the look of it. The ball goes all over the place," he said.
Tulio added, "The ball is a problem. You can't anticipate which direction it is going to go in. It is difficult for defenders to deal with and you can't take your eye off the ball until the very last second."
Japan's backup goalkeeper Eiji Kawashima, outstanding in Sunday's 2-1 defeat to England, said he had no option but to become accustomed to the Jabulani, which means "celebrate" in Zulu.
"The ball is unpredictable, doesn't swerve even when players try to curl it and it travels further," Kawashima said. "I guess it is something you just have to get used to."