PORT Adelaide has locked away one of its most promising young players, with NAB AFL Rising Star contender Sam Powell-Pepper to remain at Alberton until the end of 2020.

Powell-Pepper has signed a new two-year contract extension, in addition to his original mandated two seasons as pick No.18 in last year's NAB AFL Draft.

The 19-year-old, nominated for the Rising Star in round one, said he had settled in nicely to his new surrounds.

"I'm really thrilled, I love the club and everyone here. I'm just stoked to be here for another two years on top of my current contract," Powell-Pepper told portadelaidefc.com.au.

"I was pretty thrilled to get the [Rising Star] nomination. It's been a fairytale start to play every game and be injury free; I couldn't ask for much more.

"Working with the mids like Ollie (Wines), Ebo (Brad Ebert) and Chaddy (Chad Wingard) to give Robbie (Gray) a chop-out up forward has been great.

"I'm looking forward to working on a few things with my game with Michael Voss, like defensive running.

"In the meantime I'm just getting the hang of playing AFL footy and having fun along the way."

Powell-Pepper has played every game for the Power this season, averaging 17.4 disposals per game and has impressed with his toughness and strength around the contest.

The powerful midfielder also averages 8.9 contested possessions a game, the second-most of any Rising Star-eligible player (behind Greater Western Sydney's Jacob Hopper).

The Power have also re-signed developing ruckman Billy Frampton until the end of 2019.

Frampton, yet to make his senior debut, is progressing nicely, according to Port Adelaide football manager Chris Davies.

"It's amazing the difference continuity of training can make, particularly for a developing big man," Davies said.

"Billy is a big, strong, aggressive ruckman who loves the contest.

"He hasn't broken through for a senior game yet but his hunger to learn and improve shows he has a bright future with us."