Ki became a then club-record signing in August 2012 after joining from Celtic for £5.5million.
He signed a three-year contract and became the most expensive footballer in South Korean history.
Ki scored the final penalty in the Olympic quarter-final shootout against Team GB, and made his first Swans appearance in the Capital One Cup win over Barnsley at the Liberty before getting his first taste of Premier League football a few days later against Sunderland.
Yet to find the net in Swansea colours, Ki made 38 appearances in his debut season in English football while he started the Capital One Cup final win over Bradford.
Featured three times for the Swans at the start of the 2013-14 campaign before spending the remainder of the campaign at Sunderland.
On his return 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 Barclays Premier League campaign.
Ki maintained this form for the duration of the campaign and was named Swansea Supporters’ Player of the Year, following an impressive season from midfield where he netted eight goals.
That set a new scoring record for Korean players in a single Premier League season, with Ki beating Park Ji-Sung's previous tally of five.
He made 30 appearances in the 2016-16 season as the Swans finished 12th in the top flight.
Ki started his career at FC Seoul after spending four years in Australia, and was named the Asian Young Footballer of the Year in 2009.
He caught the attention of a number of top clubs in Europe, and eventually joined Celtic in January 2010.
While at the Hoops, Ki was named man-of-the-match after scoring in the 2011 Scottish Cup final win over Motherwell before helping them to the league title earlier this year.
Named the Korean FA’s footballer of the year in 2011, he starred in his nation’s third-place finish in the London Olympics, where he played against new team-mate Neil Taylor.
Ki was also part of South Korea's squad competing in the 2014 World Cup in Brazil.