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 guided his team to their first championship as Celtic Nation on 29 April 2014, triumphing over Aspatria 3–0 in the Cumberland Cup Final. McStay then led the side to a runner-up position in the league and achieved an unbeaten streak in their final 14 league games of the season. However, this was insufficient for securing promotion to the Northern Premier League.