Port Adelaide makes the early decision to delist Joe Atley, Wylie Buzza, Tobin Cox and Riley Grundy.
"We've reached the time of the year where we have to make difficult decisions about the direction we take with our playing list," Power head of football Chris Davies said.
"I would like to thank Joe, Riley, Tobin and Wylie for their efforts and professionalism during their time at the club, and the contribution they have made to our group.
"They will always be part of the Port Adelaide family, and we wish them well for the future on and off the field."