SECOND-row forward Stephen Bannister has left the club to join Harlequins RL.
The 19-year-old made his first-team debut in Perpignan against Catalans in August 2006 aged 18.
He was also one of the eight Saints juniors to represent England U17s against the Australian Institute of Sport (AIS) in 2005.
He has recently been on loan at Whitehaven and has made two appearances for Saints this season.
A spokesman said: