Harry Redknapp, who replaced Perrin at Fratton Park when he returned from an ill-fated spell at Southampton in December 2005, has recently splashed a club-record £7million fee on Ghana midfielder Sulley Muntari.
And he would have to pay close to £5million for Frenchman Diarra, who is thought to have become disillusioned at Lyon since former Liverpool chief Gerard Houllier quit two weeks ago.
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