Blackburn Rovers have turned down a bid for Socceroo defender Lucas Neill by English Premier League giant Liverpool.

Liverpool, which has been interested in Neill since his star showing at the World Cup, had an official bid - reportedly for about STG2 million ($A4.99 million) - turned down on Wednesday.

The transfer window closes on Thursday, so Liverpool must quickly table an improved offer or turn their interest to an alternative defensive signing.

This is the final year in the 28-year-old Neill's contract with Rovers, and if Blackburn does not sell him now or during the New Year window, they risk losing him for nothing on a free transfer after his deal expires.

Blackburn have just completed the signing of Dutch international Andre Ooijer from AZ Alkmaar, giving them some defensive coverage if Neill does depart.

Blackburn earlier this month fought off interest from Middlesbrough in another Socceroo, Brett Emerton.

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