The Daily Mail reports that Spurs are ready for a battle with rivals Chelsea for the highly-rated centre-back.
Lokomotiv Moscow are lining up an £8million bid for Spurs striker Roman Pavlyuchenko and Redknapp is ready to use the money from the sale to fund a move for Cahill.
Redknapp is confident Cahill represents the best value for a defender around.
Cahill’s current contract with Bolton is set to expire in the summer.
