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DUNEDIN, NEW ZEALAND - MAY 30: Milan Gajic of Serbia controls the ball during a Serbia training session at Otago Stadium prior to the FIFA U-20 World Cup on May 30, 2015 in Dunedin, New Zealand. (Photo by Robert Cianflone - FIFA/FIFA via Getty Images)

DUNEDIN, NEW ZEALAND - MAY 30: Milan Gajic of Serbia controls the ball during a Serbia training session at Otago Stadium prior to the FIFA U-20 World Cup on May 30, 2015 in Dunedin, New Zealand.  (Photo by Robert Cianflone - FIFA/FIFA via Getty Images)