FIRST-round pick Todd Marshall is among three Port Adelaide players to have re-signed with the club, with the young forward committing for another two years.

The Power announced on Monday that Marshall, Darcy Byrne-Jones and Sam Hayes had extended their deals. 

Marshall and Byrne-Jones, who both played in the Power's win over Fremantle on Saturday, have recommitted until at least the end of 2020, while Hayes has added another two years to his standard initial two-year deal and will be at the club until the end of 2021.

"Darcy has become an important part of our young backline," the club's football manager Chris Davies said. 

"He takes a role each week on a dangerous small forward and continues to develop the attacking side of his game. 

"Our list management and recruiting team positioned themselves well to bring Todd to the club at the end of 2016. 

"He earned his debut late last season and what he showed against Fremantle at the weekend indicates a promising future.

 "Sam has impressed coaches and teammates in the short time he's been with us. His work around the ground is good and he’s already improved his aerobic capacity."

Marshall was drafted with pick No.16 at the 2016 NAB AFL Draft, and booted four goals on the weekend in the best game of his short career.

Byrne-Jones' toughness and smarts across half-back has seen him play 44 consecutive games since making his debut, while the club has been pleased with the development of ruckman Hayes, who slipped down the draft board last year to pick No.47 despite being a two-time under-18 All Australian.

The Power's main re-signing priority remains vice-captain Ollie Wines, although the club remains confident the midfield star will be staying at Alberton Oval beyond the end of this season.