Ki was briefly Swansea City’s club-record signing when he joined from Celtic for £5.5million in August 2012.
He signed a three-year contract as he became the most expensive footballer in South Korean history at that point.
Ki scored made his Swans debut in a Capital One Cup win over Barnsley at the Liberty before getting his first taste of Premier League football against Sunderland.
In all he made 38 appearances in his debut season in English football, one of which was the Capital One Cup final win over Bradford.
Ki then featured three times for the Swans at the start of the 2013-14 campaign before joining Sunderland on loan for the rest of the season.
Having returned to the Swans, he scored his first goal for the club in the 2-1 win at Manchester United on the opening day of the 2014-15 campaign.
That was a fine start to what proved to be an excellent season for Ki, who was named supporters’ player of the year after netting eight goals from midfield.
Ki made 30 appearances in 2015-16 as the Swans finished 12th in the top flight, and clocked up another 25 club games in the 2016-17 campaign.
Ki started his career at FC Seoul before joining Celtic in January 2010.
He starred as South Korea managed third-place finish at the London Olympics.
Ki was also part of South Korea's squad competing in the 2014 World Cup in Brazil, and is now captain of his national side.