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. 21.06.2018#5548243
Serbia's Luka Milivojevic controls a ball during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018. 21.06.2018#5548277
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. 21.06.2018#5548205
Serbia's Aleksandar Kolarov runs during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018. 21.06.2018#5548230
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. 21.06.2018#5548269
Serbia's Milan Rodic hits a ball during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018. 21.06.2018#5548272
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. 21.06.2018#5548263
Serbia's Andrija Zivkovic warms up during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018. 21.06.2018#5548249
Serbia's Dusko Tosic controls a ball during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018. 21.06.2018#5548233
Serbia's Sergej Milinkovic-Savic warms up during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018. 21.06.2018#5548174
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. 21.06.2018#5548247
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. 21.06.2018#5548246
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. 21.06.2018#5548236
Serbia's Milos Veljkovic gestures running during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018. 21.06.2018#5548226
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. 21.06.2018#5548186
Serbia's Filip Kostic hits a ball during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018. 21.06.2018#5548221
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. 21.06.2018#5548181
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. 21.06.2018#5548202
Serbia's players warm up during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018. 21.06.2018#5548167
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. 21.06.2018#5548216
Serbia's Sergej Milinkovic-Savic warms up during national soccer team's training session at the Kaliningrad Stadium in Kaliningrad, Russia, June 21, 2018. 21.06.2018#5548210
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. 21.06.2018#5548144