Lee was selected by Gwangju FC as a draft pick from the University of Ulsan for the 2011 K-League season.
[4] Lee would go on to score a further seven goals during the season, finishing as his club's joint top scorer for 2011 alongside João Paulo.
[5] In 2015, Lee Seung-Gi moved the team Jeonbuk Hyundai Motors to Sangju Sangmu FC, because he was to enlist within 2 years.
In 2011, Lee was selected in the Republic of Korea squad for the AFC third round of the qualification matches for the 2014 World Cup.
He made his international debut as a substitute in Korea's win over the United Arab Emirates on 11 November 2011.