Promising youngsters James Fisher-Harris and Nathan Cleary have extended their deals with Penrith Panthers until 2019, the NRL club announced on Thursday.
Both players were contracted until the end of 2018 but agreed to improved terms in return for an additional year on their respective deals.
Fisher-Harris, 20, made his NRL debut in round one this year and has represented the Junior Kiwis.
"Despite the fact James has only played a handful of NRL matches, we are extremely confident in his potential and have invested in his long-term future with this deal," Panthers Executive General Manager Rugby League Phil Gould said in a statement.
"I have no doubt this young man will be an integral part of our NRL team and a regular member of the New Zealand Test squad in years to come."
Cleary, meanwhile, played alongside Fisher-Harris to claim the 2015 Holden Cup Premiership, but the 18-year-old has yet to taste NRL action.
"Nathan is an outstanding young man who first entered our playmakers academy back in 2011," Gould added.
"Whilst he is yet to make his NRL debut, we are investing in Nathan being one of our halves in the long-term future of the Panthers."