FIFA has moved to reassure football fans it will not manipulate the World Cup draw on Friday to favour certain teams.
Former FIFA president Sepp Blatter claimed last year that some European football draws have been fixed in the past with the use of hot and cold balls.
He said: “It’s technically possible. It did not happen in FIFA, but I witnessed draws at a European level in which it happened - but never in FIFA. It could have happened, but in my case it never did, ever.
“If you put the balls in the refrigerator before, a simple comparison between one and the other by touching them determines the cold and hot balls. By touching them, you already know what it is.”
UEFA called the claims "completely absurd" while Chris Unger, FIFA director of competitions, said: "There's no truth to that.
"They're all the same; they don't feel any different, they don't look any different with the exception of the red balls, which are there for a purpose.
"It's entirely random and by chance how the groups get formed at the end."