Gall made his senior debut for England versus South Africa in March 2017, having represented his country at under-16, under-18, and under-21 levels. He played for England under-21 in the 2013 and 2016 Junior World Cups and won a bronze medal at the 2014 European under-21 championships. He joined the Great Britain Centralised Programme in 2017 and was a member of the Great Britain squad which won the 2017 Sultan Azlan Shah Cup Final in Ipoh, Malaysia on 6 May 2017 – the first time either Great Britain or England had won this title since 1994.