[5] On 12 December 2022, McGuigan left Newcastle with immediate effect to join Premiership rivals Gloucester on a long-term deal.
[6] After successfully completing trials in 2010 McGuigan was selected to represent the Ireland U18 squad.
On 1 February 2013 McGuigan made his debut against Wales, creating several try-scoring opportunities as well as injuring himself in the process, only to carry on and make a match saving tackle in his own final third.
McGuigan was called up by England Saxons for their 2016 tour to South Africa where he played two matches from the bench.
[7][8] In June 2022 he was called up by Eddie Jones to join a training camp with the senior England squad.