Castleford have activated options on the contracts of outside backs Tuoyo Egodo and Kieran Gill for 2019.
Egodo, 21, formerly with London Broncos, and Gill, 22 have made just one Super League appearance apiece but both are in coach Daryl Powell's squad for Friday night's rearranged game at Hull KR.
Powell said: "I'm really pleased that two really promising young players have extended their contracts with the club for another year.
"Kieran Gill has just come back from a long-term knee injury and has physically grown during that time to the point where he has a great chance to press a claim in the first team and Tuoyo Egodo has the physical presence that could make him a really good Super League player.
"Both players now need to apply themselves massively over the next year and a half to give them the best possible chance of being consistent Super League players."