 Over the course of the 2011–12 campaign, Ki scored seven goals and had six assists, playing a key role in helping Celtic win the Scottish title.On 24 August 2012, Ki transferred to Swansea City for around £6 million on a three-year contract, which was Swansea's record transfer fee until it was later broken by Wilfried Bony.Ki made his debut for "the Swans" in a 3–1 victory against Barnsley in the second round of the League Cup at Liberty Stadium on 28 August.