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.
The GB7s women's squad is currently training at Wales' Centre of Excellence where assistant coach Richie Pugh tells WRU TV's Graeme Gillespie some 'tough calls' will have to be made when it comes to finalising the 12 spots for Rio's Olympic Games.
Wales U20's Billy McBryde is looking forward to starting his first game against New Zealand this afternoon in the World Rugby U20 Championship where his side are looking to gain revenge from last week's pool defeat to the Kiwis.