His hat-trick against Inter Milan
in the Champions League in October 2010 thrust the Cardiff-born left-sided player into the world spotlight, but Redknapp reiterated that any approach from England or abroad would be rebuffed.
"They [Barcelona, Man City, Real Madrid] are the only ones who could afford to pay the transfer fee and his wages, but he isn't for sale.
"The chairman has said he isn't for sale. If you are looking to go somewhere you don't go and sell a player like him."
Tottenham are seven points behind leaders Manchester City, with a game in hand, and lead fourth-placed Chelsea by four points, also with a game in hand.
Despite his side's excellent run of form, Redknapp refused to be drawn on the chances of Spurs winning the league championship for the first time since 1961.
He added: "It's not impossible. It's very difficult but I never said we couldn't win the league. We have to just keep picking up points and see where that takes us."
Lambert admires 'top' Spurs
Tottenham travel to Swansea on New Year's Eve, when the former Portsmouth boss hopes to have more selection options.
"When everyone is fit we are very strong," Redknapp added.
"Michael Dawson and Tom Huddlestone are on their way back and Jermain Defoe could be back for the weekend."
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.