McStay led his side to their first trophy as Celtic Nation on 29 April 2014, defeating Aspatria 3–0 in the Cumberland Cup Final. McStay went on to lead the side to a second-place finish in the league, and went undefeated in their final 14 league games of the season. However, this was not enough to gain promotion to the Northern Premier League.
McStay's team secured its first championship as Celtic Nation on April 29, 2014, by defeating Aspatria 3–0 in the Cumberland Cup Final. McStay then led his side to a close second-place finish in the league and achieved an impressive undefeated streak in their final 14 league games of the season, but ultimately failed to secure promotion to the Northern Premier League.