A statement from Irish Rugby said: “The thoughts and prayers of everyone involved in rugby go to the families of Jack and Shay. The Irish Rugby family stands #shouldertoshoulder with their families and everyone in Ennis.”
Meanwhile departing Munster star Simon Zebo was also among those to pay tribute to the Ennis RFC U15 stars.
“Very sad news to hear of the passing of Jack and Shay. Their friends and families are in our prayers @EnnisRugby,” he wrote on Twitter.