 He made his debut for Celtic in a 1–1 draw against Falkirk at Celtic Park on 16 January 2010, winning the "Man of the Match" award from the official Celtic website.He played a further four matches for Celtic that season, but struggled to make much impact in what was a period of upheaval for the club.Ki barely played for Celtic in the first month of season 2010–11, but came off the bench to score his first competitive goal for Celtic on 22 August 2010 with a shot from 25 yards in a 4–0 victory against St Mirren in the Scottish Premier League (SPL).