Draws to decide which teams play each other are conducted by selecting the table tennis-size balls from plastic bowls. The balls are unscrewed to reveal the team names inside.
Blatter, however, insisted the ruse was never used at FIFA.
"Of course it's technically possible. That doesn't happen in FIFA but I witnessed draws, at European level, in which that happened, but never at FIFA," Blatter told Argentine daily La Nacion in an interview on their website.
