And the Spurs manager confirms that William Gallas will also miss Saturday's trip to the DW Stadium, as the Frenchman's knee injury adds to his side's defensive woes
The midfielder missed Wales' Euro 2012 qualifier defeat to England, after feeling tightness in his hamstring during training.
And while Redknapp bemoans the loss of his wing wizard for a match which insists is as important as the midweek clash with Real, as his seek a top-four finish again, the Spurs boss remains confident of Bale's involvement at the Bernabeu.
"We've got a few knocks at the moment," Redknapp told reporters. "Gareth [Bale] is not fit for tomorrow [Saturday's match against Wigan]. His hamstring is still a little bit tight."
"You never know with those injuries," replied Redknapp - when quizzed on the likelihood of Bale's involvement on Wednesday, "you can't tell with hamstrings.
"Until he pushes it we wouldn't be sure.""It's a vital game tomorrow," he added. "If he was fit I'd play him at Wigan, for sure, but he's not available.
"Tomorrow's all important for us. I can't even look at Tuesday."
"We still want to do our best to make that top four, that's our aim," Redknapp continued. "We've got to look to get Champions League football for sure next year if we can.
"So we've got to keep picking up points."
"William Gallas as well," Redknapp added, "his knee is giving him problems at the moment. So they're both certainly not fit."
Gallas joins defenders Ledley King, Jonathan Woodgate and Younes Kaboul on the sidelines as Spurs' defensive crisis intensifies, with Michael Dawson and Sebastien Bassong the only recognised defenders available to Redknapp.