The Wales international has reportedly asked to leave for Santiago Bernabeu, after the club offered Spurs €100m (£86.4m) for their winger.
And the ex-goalscorer has conceded that Los Blancos are the biggest club in the world.
“You cannot blame Bale for wanting to go to Real Madrid,” he told the Sunday Mirror.
“It's an opportunity that only comes along once in a lifetime.
“They are probably the biggest club in the world and it is difficult to reject the chance to play there.”
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