The Croatian midfielder has been in fantastic form this season and has shone in the team's great run in the Champions League, which has brought him to the attention of a wider audience.
Inter Milan, Juventus and Chelsea have all been linked with a summer move for the 25 -year-old, who signed a new six year deal at the club last summer, but Redknapp has told them they needn't bother as he will not be persuaded to sell at any price.
Speaking to Croatian newspaper Sportske Novosti, Redknapp said: "I wouldn't want to sell him for £100million, not even for a billion.
"He's the hub of the team."
Tottenham last week