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WEST Coast is poised to secure Geelong big man Nathan Vardy in the final two days of the NAB AFL Trade Period after a breakthrough in negotiations on Tuesday.

Vardy, who can play as a ruck and a forward, has indicated his preference to join the Eagles and the club will now work on a deal with Geelong before Thursday's 2pm deadline.

The Cats had grown more confident Vardy would remain at the club in 2017 but it is understood he nominated the Eagles as his preferred home late on Tuesday.

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The Eagles have also made him their priority after "casting a wide net" in their search for a ruckman, which saw them linked to fellow big men Drew Petrie and Will Minson.

Vardy is expected to make his way to West Coast in exchange for a fourth-round selection in the NAB AFL Draft.

The Eagles have been desperate to replenish their ruck stocks to cover long-term injuries to Nic Naitanui and Scott Lycett, with Vardy an ideal fit as a forward-ruckman.

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The 25-year-old had also drawn interest from Port Adelaide but any trade there was likely to hinge on the Power being able to find a new home for Matthew Lobbe, which has not eventuated.

Vardy, who visited the Eagles for medical tests last week, has played 25 games for Geelong, including just one in 2016 as he fell behind tall recruits Rhys Stanley and Zac Smith.

Frustrated by a lack of senior opportunities, he chose not to sign a contract extension with Geelong, weakening the Cats' position at the trade table with West Coast.