On 30 June 2014, Kingsley signed for Swansea City on a three-year deal for an undisclosed fee. On 18 February 2015, Kingsley joined English League One side Yeovil Town on a month's emergency loan which was later extended until the end of the season. Kingsley played in numerous positions in his 12 appearances for the Glovers including left-back, centre-back and midfield, and received praise for his versatility from Yeovil boss Terry Skiverton. Yeovil were subsequently relegated to League Two at the end of the season and Kingsley returned to Swansea City. Kingsley joined English League One side Crewe Alexandra on an emergency loan in August 2015. He made 12 appearances for them before returning to Swansea after the emergency loan expired in November. He made his Swansea City debut in their FA Cup 3–2 defeat away to Oxford United, on 10 January 2016. He made his Premier League debut on 2 March 2016 in Swansea's 2–1 victory away to Arsenal.
Hull City
Kingsley moved to Championship club Hull City in August 2017 for an undisclosed fee.
International career
In April 2012 Kingsley was called up to the Scotland under-18 squad for two games against Serbia in Belgrade on the 17th and 19th of the month. He played 90 minutes in the first game, which ended 1–1, and 60 minutes in the second game, where Scotland won 4–1. In season 2012–13 he appeared for Scotland under-19s against Germany and the Netherlands. He was selected for the squad for the 2014 UEFA European Under-19 Football Championship qualification matches in October, playing in the third game against Switzerland. This was followed in March with an appearance in the friendly match against Sweden. In May he played in two of the Elite qualifying round games in Belgium against Belgium and Georgia. In March 2015, Kingsley made his Scotland under-21 debut in a 2–1 win against Hungary. This was followed up with four appearances for the side against France twice, Northern Ireland and Iceland in their Euro Championship Qualifying group. On 20 May 2016, Kingsley received his first call-up to the Scotland national football team for their friendlies against Italy and France. He made his Scotland debut as a substitute in a 3–0 defeat against France, on 4 June 2016.
