Koo Ja-cheol announces retirement, future at Jeju SK FC - Korea JoongAng Daily
Korea Republic’s Koo announces retirement - AFC website
"Don't think about 2002!" Ex-captain Koo calls on South Korea to create new World Cup history - ESPN
The top 5 South Koreans in Bundesliga history - bundesliga.com
Koo Ja-cheol Returns to Jeju United - K League United
Koo Ja-cheol injures left foot in practice - The Korea Herald
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