Nigeria's players run during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's players play with a ball during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's head coach Gernot Rohr throws a ball during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's William Ekong, centre, and his teammates warm up during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's William Ekong warms up during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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From left, Nigeria's Odion Ighalo, Elderson Echiejile and Ogu run during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's head coach Gernot Rohr, centre, and his players run during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's Elderson Echiejile reacts as he warms up during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's goalkeeper Ikechukwu Ezenwa warms up during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's players run during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's Ahmed Musa, left, and Nigeria's Victor Moses, right, cheer warming up during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's Victor Moses warms up during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's players warm up during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's head coach Gernot Rohr, fourth left, and his players run during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's head coach Gernot Rohr, centre, talks to his players during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's head coach Gernot Rohr walks during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's Ahmed Musa, left, warms up during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's William Ekong drinks water during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's players run during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's head coach Gernot Rohr watches his players during national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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Nigeria's head coach Gernot Rohr listens to the questions during a news conference before national soccer team's training session in Volgograd, Russia, June 21, 2018.

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Nigeria's goalkeeper Francis Uzoho poses for a photo during a news conference before national soccer team's training session at the Volgograd Arena in Volgograd, Russia, June 21, 2018.

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