Redknapp hoped he would be able to buy him this summer with competition for places intense at Spurs following a busy summer of transfer activity.
But he admitted: "Andros did great last year but Tottenham don't really want to sell him. He's not for sale as far as I know.
"It's difficult. I couldn't see us being able to buy him. I think he'd be too expensive for us.
"But I do like Andros - he'd be brilliant. I'd love to sign him on loan but whether we could do that, I wouldn't bet on it."
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