Serbia's Dusko Tosic, left, and Serbia's Sergej Milinkovic-Savic play with a ball during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Luka Milivojevic controls a ball during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's head coach Mladen Krstajic smiles watching his players during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Aleksandar Kolarov runs during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Andrija Zivkovic, left, and Serbia's Milos Veljkovic play with a ball during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Milan Rodic hits a ball during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Luka Milivojevic talks to a team member during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Andrija Zivkovic warms up during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Dusko Tosic controls a ball during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Sergej Milinkovic-Savic warms up during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Filip Kostic plays with a ball during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's head coach Mladen Krstajic, right, reacts speaking to a team member during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Luka Milivojevic smiles as he warms up during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Milos Veljkovic gestures running during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Sergej Milinkovic-Savic gestures as he warms up during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Filip Kostic hits a ball during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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From left, Serbia's Nemanja Matic and Milos Veljkovic play with a ball during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's goalkeeper Marko Dmitrovic reacts as he warms up during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's players warm up during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's goalkeeper Vladimir Stojkovic, left, reacts as he warms up during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's Sergej Milinkovic-Savic warms up during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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Serbia's head coach Mladen Krstajic, left, watches his players during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018.

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