Port Adelaide legend Kane Cornes says the AFL must intervene and prevent GWS midfielder Tom Scully from going to Hawthorn in the deal that is apparently on the table.

The current deal could see the star Giant move to the Hawks for a pick in the 50s in this year's NAB AFL Draft, with Cornes saying the AFL must act now to stop the deal from going ahead.

"I know he's had ankle (problems) but Tom Scully is an elite midfielder of the competition," Cornes said on Trade Radio.

"The AFL just can't allow him to walk for pick 53 to one of the strongest clubs in the competition.

"There must be some restrictions … it has to be a first-round draft pick, surely. The AFL must step in," he added.

Scully made the All-Australian squad in 2017 before a serious ankle injury in Round 2 sidelined him for the season in 2018.