Mezue ahịrịokwu na-esonụ: Ọ tụfuru nsonye maka ndị otu Mba isii nke 2014 n'agbanyeghị ọtụtụ ndị kwenyere na Scotland enweghị onye na-emeghe ebe a na-emeghe. Mgbe a họpụtara Vern Cotter dị ka onye nkuzi Scotland, Barclay esoghị n'otu n'ime ndị otu Scotland ya n'afọ mbụ, gụnyere Cotter nke mbụ Mba isii. Agbanyeghị, a họpụtara ya na ndị otu egwuregwu World Cup nke 2015 wee nweta egwuregwu mbụ ya kemgbe 2013 na egwuregwu nke abụọ megide Italy na August 2015. Ọ bụ ezie na a hapụrụ Barclay n'asọmpi Iko Mbaụwa ikpeazụ, a gụnyekwara ya ọzọ n'asọmpi Scotland maka asọmpi a.
2016 Six Nations Championship ma bido egwuregwu anọ mbụ na blindside flanker, na-agba mbọ na mmeri na Italy.