Adelaide has reacted angrily to the AFL's offer of a single extra pick at the end of the first round of the national draft in compensation for the loss of star defender Nathan Bock, labelling it 'grossly inadequate'.

The league confirmed on Thursday afternoon that the Crows would receive the extra first-round pick for Bock, to be taken after every club has made its first-round selection, at any of the next five national drafts.

Port Adelaide won't be as well compensated for the departure of youngster Nathan Krakouer, the Power to be given an extra pick immediately after its second-round selection, which can again be taken at any of the next five national drafts.

Both Adelaide and Port are also permitted to trade the compensatory picks to other clubs but it is the Crows who have jumped on the front foot with the intention of appealing the decision.

"We believe that if Nathan was available on the open market he would certainly attract much more than one first-round draft pick from another club," said Adelaide football operations manager Phil Harper.

"He was an All Australian two years ago when he also won our club champion award, is only 27 and if he was still on our list right now he would be rated right near the top."

"We believe that compensation for a player of Nathan's ilk would be a minimum of band two," Harper added of the criteria the AFL will apply to any uncontracted player that leaves his club to move to the Gold Coast Suns.

"Because of all this, the club owes it to its members and supporters to strongly appeal this decision to the AFL."

Port Adelaide is yet to comment publicly on the rating and compensation it will receive for Krakouer.