Port Adelaide has axed midfield coach Shaun Rehn, to be replaced by West Coast strategy and innovations coach Phil Walsh.
"To have such an experienced and well-credentialed coach like Phil return to our club is very exciting," Port Adelaide director of coaching and strategy Alan Richardson said.
"Having spent the last five seasons at such a great club like West Coast, Phil will bring a wealth of experience and fresh ideas to our coaching panel.
"He played such a vital role in our club's 2004 premiership win and also the 2007 finals campaign. We see him as a perfect fit."