Percival played junior rugby for Halton Hornets before joining St Helens' academy side.

[6] St Helens reached the 2014 Super League Grand Final, and Percival was selected to play at centre in their 14–6 victory over the Wigan side at Old Trafford.

[15] Percival played for St Helens in their 2021 Super League Grand Final victory over Catalans Dragons.

[16] On 24 September 2022, Percival scored the winning try for St Helens in their 2022 Super League Grand Final victory over Leeds.

[24] Percival was selected in England's 24-man squad for the 2016 Four Nations, and made his international début in a pre-tournament warm-up game against France.