St Helens trio Mark Percival, Luke Thompson and Greg Richards have all signed new contracts with the Super League club.
The three players, who all made their first-team debuts last season, have committed themselves to the Saints until 2018.
"We're delighted to have signed up Mark, Luke and Greg. They are three good players who are continuously improving the more Super League experience they get," head coach Nathan Brown told the club's official website.
"Their task now is to keep their heads down, work hard and learn from the experience of playing first-grade rugby league. If they do that then they can all go far in the game."
Super League leaders St Helens continue their campaign on June 14 when they make the trip to Catalans Dragons.
