By FOX Sports staff
Bale became the world's most-expensive player at the end of last month when he completed a move to Real from Barclays Premier League side Tottenham, eclipsing the €75m that Los Blancos paid to Juventus for Zidane back in 2001.
At that time, Zidane's transfer fee was regarded by many as a ridiculous sum to be paying for a player, even one of his calibre, and the Frenchman claims he is still perplexed by how much money is being splashed.
"Ten years ago I was bought for €75m and I said I was not worth this," he told Canal Plus.
"Even now I would think that a player is not worth this. It's football, unfortunately.
"It is incomprehensible to pay so much."
However, Zidane was quick to stress his comments were not a slight to Bale, who he believes will achieve great things at the Santiago Bernabeu.
"My role will certainly be to explain that he has to play as he knows," the former France captain added.
"This is a player who has incredible potential, which he has demonstrated over the past three years and he is certainly among the top three players.
"But he can still progress a lot. I think he can bring a lot to Madrid."
Real have made it a habit of splashing the cash on world-class players in recent seasons, breaking the bank to sign both Cristiano Ronaldo and Kaka in the summer of 2009.