The Eagles have been impressed by Dixon's recent training period with the club, with the 197cm tall now set to join Adam Simpson's side through the Supplemental Selection Period.
Dixon booted two goals in last week's practice match loss to the Dockers, with the Eagles in need of bolstering their key forward stocks and seeing the East Fremantle tall as a perfect fit.
The 23-year-old will sign a rookie contract with the Eagles following the club's decision to move retired defender Brad Sheppard to their inactive list.
Dixon made just one appearance for the Dockers during his time at Cockburn, featuring against the Power in 2019, booting one goal from eight disposals.
“We have been impressed with Hugh’s approach to winning a place on our list and he could not have done any more to convince us that he deserves this chance,” Eagles' national recruiting and list manager Rohan O’Brien said.
“He was among our best in the practice game last Friday night and we think he has a lot to offer.
“He turned 23 just last week, has been in the system previously and understands the demands at the elite level.
“Hugh has settled in nicely at the club and certainly the other players were rapt for him when they were told he would be added to our squad.”
The Eagles' decision to sign Dixon comes amid uncertainty surrounding the future of star forward Jack Darling, who is yet to comply with the AFL's vaccine mandate.
The Eagles will continue to trial players throughout their pre-season for the remainder of the SSP window, which closes next Wednesday.
Former Tiger Patrick Naish is the latest ex-AFL player to join the Eagles' training regime ahead of Round 1, with former Lions midfielder Tom Joyce and ex-Docker Luke Strandica also vying for a list spot.