Black Cats boss Steve Bruce wants to exchange Anton Ferdinand for Alan Hutton as both players are unhappy where they are and want to return nearer their roots.
Right back Hutton, 27, signed for Spurs from Rangers for £9m in January 2008 but has struggled with injury ever since and is now behind Vedran Corluka in the pecking order.
Straight swap? Sunderland's Anton Ferdinand (left) could replace Alan Hutton at Spurs - and vice-versa
He wants to head back north while Ferdinand, 24, has fallen out of favour with Bruce and a move back to London - he signed from West Ham last year - could revive his career.
Bruce has been using Ghana international John Mensah and Paraguayan Paulo Da Silva instead of Ferdinand along with £6m summer signing Michael Turner.
Now he wants Hutton to provide competition for full-backs Phil Bardsley, George McCartney and Kieran Richardson.
Redknapp, meanwhile, wants cover in central defence with Ledley King and Jonathan Woodgate's fitness problems refusing to go away and knows a return to the capital would tempt Ferdinand.
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