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OSAKA, JAPAN - MAY 27: Cha Du Ri #5 of FC Seoul (R) in action,Ritsu Doan #38 of Gamba Osaka is debut (16years old) during the AFC Champions League Round of 16 match between Gamba Osaka and FC Seoul at Expo '70 Stadium on May 27, 2015 in Osaka, Japan. (Photo by Masashi Hara/Getty Images)

OSAKA, JAPAN - MAY 27: Cha Du Ri #5 of FC Seoul (R) in action,Ritsu Doan #38 of Gamba Osaka is debut (16years old) during the AFC Champions League Round of 16 match between Gamba Osaka and FC Seoul at Expo '70 Stadium on May 27, 2015 in Osaka, Japan. (Photo by Masashi Hara/Getty Images)
Getty Images

Getty Images Sport Masashi Hara