Lewis Stevenson joins Port Adelaide as part of the trade that sends David Rodan to Melbourne.
"Lewis has often been really close to selection in what is a very good West Coast line-up and was an emergency on several occasions in 2012, including in their semi-final," Power football operatios manager Peter Rohde said.
"While he couldn't break into the AFL team, he has done everything right and has been very impressive with his WAFL side Claremont, where he was part of their back-to-back premierships in the past two seasons.
"His 2012 form was possibly the best of his career and he comes very highly recommended by football people in Western Australia."