Uncapped Port Adelaide midfielder Hugh Jackson is set to spend close to four months on the sidelines after requiring hip surgery.
An arthroscopy was scheduled after Jackson reported hip concerns earlier this year, with the club deciding to have the 20-year-old go under the knife.
The listed recovery timeframe is 16-18 months, placing Jackson out of action for more than half the coming season.
The Crystal Brook product, who was drafted with Pick 55 at the 2021 National Draft, is yet to feature at AFL level as he enters his third season at Alberton.
The hard-nosed midfielder played 15 games at SANFL level last year, averaging 19.3 disposals, 5.7 tackles and 4.7 tackles per game.
Jackson joins fellow young Port Adelaide pair Kyle Marshall (back) and Tom McCallum (ankle) on the sidelines, with the latter duo currently out of action indefinitely.
The Power have also revealed all of Aliir Aliir (back), Jeremy Finlayson (shins), Trent McKenzie (hamstring), Willem Drew (shoulder), Esava Ratugolea (knee) and Todd Marshall (foot) are in the mix for this week's practice match against Adelaide, however do further monitoring in the coming days.
Port Adelaide will host the Crows at Alberton Oval on Friday at 5:00pm ACDT, with a second practice match to come next week against Fremantle, also at home.
The Power face West Coast for Round 1 on Sunday, March 17 at Adelaide Oval to open their season.