Holland was added to the senior Ireland squad for the 2015 Six Nations Championship game against England on 24 February 2015. He was named in the Emerging Ireland squad for the 2015 World Rugby Tbilisi Cup on 19 May 2015. Holland started in the opening 25–0 win against Emerging Italy on 13 June 2015. Holland started in the 33–7 win against Uruguay on 17 June 2015. He captained the side in the 45–12 win against Georgia on 21 June 2015, a win which secured the tournament for Emerging Ireland.