St Helens trio Ade Gardner, James Graham and Ian Hardman have extended their deals until the end of 2008.
Gardner, 22, played his 100th game for Saints in the final match of 2005 and has scored 41 tries for the club.
He was also named in the Great Britain training squad but missed out on final selection for the Tri-Nations series.
Prop Graham and utility back Hardman, both 20, made their debuts against Castleford in 2003 and have become established members of the squad.
"Ade, James and Ian are part of a strong core of youth talent which underpins our squad and the club as a whole," said coach Daniel Anderson.
"I expect to see continuing improvement from them all, which is an exciting prospect for the Saints as they are already established players."