Tottenham boss Redknapp denies knowing details of Ba's Newcastle contract
Redknapp last week increased speculation about the Senegal international after claiming there is a buyout clause, reported to be £7million, within the striker's contract.
And the Tottenham boss has again indicated he is paying attention to Ba, adding: "I keep hearing conflicting stories about the buyout clause.
"One person says one thing and (then) somebody comes on and says he can be bought out for X amount.
"I think the only people that probably know are Newcastle and Demba Ba."