The Spurs chief will give his version of events to a jury after being accused of taking £189,000 bungs in a Monaco offshore account.
Jurors have been told how the 64-year-old denied tax dodging to police by saying: "I write like a two-year-old and I can't spell."
Redknapp also urged detectives to ask his solicitor if he had "ever come across anyone as bad, business-wise".
Redknapp - tipped as a future England boss - is expected to take to the stand after his former Portsmouth chairman and co-accused Milan Mandaric finishes his evidence at Southwark Crown Court.
Mandaric said the accusations of tax dodging are "sad, unfair and an insult" to his family, his associates and "even some of those supporters".
He has said he was worth more than £100million at the time and paid £55million in taxes over six years.
Mandaric said "not in a million years" would he have paid £189,000 into the account to avoid taxes.
Both Redknapp, 64, of Poole, Dorset, and Mandaric, 73, from Oadby, Leicestershire, deny two counts of cheating the public revenue when Redknapp was manager of Portsmouth Football Club.
The first charge of cheating the public revenue alleges that between April 1 2002 and November 28 2007 Mandaric paid 145,000 US dollars (£93,100) into the account.
The second charge for the same offence relates to a sum of 150,000 US dollars (£96,300) allegedly paid between May 1 2004 and November 28 2007.
