ONE OF the AFL's most remarkable stories will continue in 2026, with Fremantle confirming the signing of Mason Cox a month after he was delisted by Collingwood.

Cox's rise from American college basketballer to premiership player at the Magpies has been well told, and the American has added another chapter to his story by joining the Dockers on a two-year deal as a pre-season supplementary selection period (SSP) signing.

WHO'S CALLED IT QUITS 2025's retirements and delistings

The SSP window, which runs until February 20, opened on Monday and allows clubs to add extra players to their list following the national and rookie drafts last week.

How much senior footy Cox will play in 2026 remains to be seen, with the Dockers already well served in the ruck department by Luke Jackson and Sean Darcy.

The 34-year-old Cox played 10 games in 2025, spending a lot of time as a permanent forward.

Freo had been on the hunt for an extra ruckman after Liam Reidy left during the trade period to join Carlton.

"We see a real benefit with having a 211cm premiership ruck of the calibre of Mason Cox joining our program," Fremantle list boss David Walls said.

"We are really pleased with our ruck combination of Sean Darcy and Luke Jackson and see Mason adding to our depth in that department, his knowledge and experience will be really valuable. 

"We have 19-year-old Aiden Riddle developing nicely and he will benefit greatly, along with Luke and Sean. 

"We look forward to welcoming Mason to the club."

Cox was signed by Collingwood as an international rookie in 2014 and famously debuted on Anzac Day 2016, kicking the first goal of the game in front of 85,082 people at the MCG.

After 20 games over his first two seasons on the Magpies' main list, Cox became a regular in 2018 as Collingwood shot back up the ladder.

In one of the most extraordinary preliminary final performances, Cox powered Collingwood into the 2018 premiership decider with a towering effort to help dethrone red-hot favourites Richmond.

The Magpies went down to West Coast the following week in a thriller, but Cox became a premiership player five years later when Collingwood defeated the Brisbane Lions in an epic 2023 Grand Final.