Huddersfield Giants hooker Kruise Leeming has signed a three-year professional deal.
The 17-year-old is the second youngster to be handed a professional contract this month after half-back Jack Miller signed a two-year deal last week.
Head of youth Peter Riding told the club website Leeming was "deserving" of a move to "the full-time environment".
"He has great potential as those who saw him pre-season at St Helens would recognise," Riding added.
"I look forward to watching his progress."