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 winners of a filmmaking competition organised by the education charity Into Film and the WRU enjoyed a behind the scenes tour of the Millennium Stadium - and a chance to be photographed with the WRU's fire-breathing, rugby loving mascot, Scorch The Dragon, and Welsh international, Jake Ball.
The Wales Under 20 camp are in a quietly confident mood as they face Ireland in the U20 Championship, with Coaching Co-Ordinator Allan Lewis and full back Dafydd Howells targeting a top five finish in the tournament.
Wales U20 may start as favourites against Japan this evening in the U20 Championship, but Team Manager Mark Taylor is warning against complacency. He is also hoping a good win will boost morale and 'kickstart' performances.
Coach Richard Hodges is hoping Wales U20 can put a disappointing campaign behind them when they tackle Japan tomorrow as they look to finish the U20 Championship strongly to secure a good seeding for next year's tournament.