Wales Under-20 wing Josh Adams is to leave Scarlets' academy to join English second-tier club Worcester ahead of the 2015-16 season.
Adams is part of the age-grade squad who will challenge for the Junior World Championship in Italy in June.
He is "disappointed" to be leaving the west Wales region.
"The Scarlets have been very good to me over the past two-and-a-half years so hopefully Worcester will be just as good," said Adams.
He would not rule out a return to Scarlets or another Welsh region in future.
Worcester are currently in the four-team Championship play-off to determine the one team who will be promoted to the Premiership.
Adams says he had interest from other English teams and from France, adding: "Worcester was my favourite option, really."
Scarlets told BBC Wales Sport they "won't be making any comment at this stage" on Adams' future.