The Spanish giants have been heavily linked with the Welshman all summer with Bernabeu president Florentino Perez hopeful of completing a £100 million world record fee.
But it is believed Spurs are not happy with the payment package offered by Madrid, who still owe the North London side cash from last August's £33 million deal for Luka Modric.
Real have reportedly offered £20 million upfront, with £80 million being paid over a five-year period, but Tottenham chairman Daniel Levy wants the full sum paid straight away if he is to let his prized asset move to the Spanish capital.
With the September 2 transfer deadline looming Real are becoming increasingly concerned they will not be able to complete a deal, with their top priority extending the contract of Cristiano Ronaldo.
Bale was absent from the Tottenham squad yesterday as they started off the campaign with a 1-0 win at Crystal Palace and is expected to be out for the rest of the month with a foot injury.
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