PORT Adelaide has re-signed emerging pair Karl Amon and Darcy Byrne-Jones until the end of the 2017 season.

Neither 19-year-old has made an AFL debut but great SANFL form has the club excited for their futures.

Amon in particular has enjoyed a stellar pre-season and was talked up by coaches and teammates as one player set to break into the senior side in 2015.

Byrne-Jones, a small, running defender, was drafted with pick No.52 at the 2013 NAB AFL Draft while Amon – a wingman/forward – was taken with pick No. 68.

"They've got big futures with the club and in the AFL system and that's why they've been rewarded with new contracts," assistant coach Aaron Greaves told the club's website.

"They've put on size, both now train and behave like elite AFL footballers, and have developed elite habits.

"Karl has shown good progression over pre-season and is able to transfer his training into games, which is going to help him achieve consistency.

"Darcy still continues to learn and work on his role, and he is working hard to take what he learns and apply it on game day as well."