Port Adelaide has officially lodged the paperwork with AFL House to sign Brisbane free agent, Tom Rockliff.
The Lions have three days to match the Power's offer, however, they are not expected to do so.
With Carlton and Port both pursuing Rockliff this season, the 27-year-old confirmed his desire to join the Power last week.
"I got (confirmation) through Jason Cripps our list manager last night. It wasn’t too long after the news had broke that Tom had made Carlton aware," Port Adelaide football boss Chris Davies said on AFL Trade Radio.
"We’re pleased Tom has shown a willingness to come to our footy club.
"We’re in a position where we think Tom can add to a pretty strong midfield already.
"We think (Tom) wants to go to a club that gives him the best chance to play finals."
Rockliff has played a total of 154 games for the Lions since being recruited with pick No.5 in the 2009 Pre-Season Draft.
He averaged 24 disposals, six tackles and kicked 16 goals in 20 games this season.
