Robin McBryde has been forced to miss this weekends clash against Edinburgh after injuring his ankle at home.
Marcus Thomas will start instead of the injured McBryde, whilst Phil John steps up onto the replacement bench.
Although Phil John plays prop for Llanelli he has played at number two before, and with Aled Gravell (broken wrist) and Adam Yelland (Torn ankle ligaments) ruled out it leaves Llanelli with no other option apart from John.
Nearly 40 players were involved in the first Wales Under 18 training session of the season. WRU National Performance Manager Gethin Watts is excited at the potential shown by the group and expects the Regional Under 18 Championship to hone their skills even further.