[1] A former pupil of the Royal High School, Edinburgh, Shiel played for their then associated side RHC Cougars.

[3] Shiel entered the Scottish Rugby Academy in the 2015-16 season as a Stage 2 player.

[4] Shiel was previously enrolled in the BT Sport Scottish Rugby Academy as a Stage 3 player.

However Shiel has turned out for Glasgow Warriors in their 2017-18 pre-season match against Northampton Saints.

[9] Shiel received his first call up to the senior Scotland squad in February 2021 for the 2021 Six Nations Championship.