The news has been confirmed this lunchtime.
The Welsh beat Italy in their opening match but have lost their last two games against England and Scotland while Ireland have bounced back from their defeat to the Scots with wins over Italy and France.
Former Ireland captain Keith Wood says Joe Schmidt's side should be confident of winning.
Clonmel native Bill Johnson, who performed so well in last year's World Cup, is in the Ireland U20 side for Saturday's Six Nations match against Wales.
Fineen Wycherley of Cistercian College Roscrea has also been included in the team.
The second row, who made his Munster debut against the Cardiff Blues last weekend, returns to a side hoping to make it four wins out of four in the competition.
