From left, Slovakia's Denis Vavro, Michal Duris, Vladimir Weiss, Ondrej Duda and Stanislav Lobotka attend a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's Peter Pekarik, in center, attends a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's players attend a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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From left, Slovakia's Ondrej Duda, Jan Gregus and Marek Hamsik attend a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's head coach Stefan Tarkovic attends a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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From left, Slovakia's Michal Duris and Vladimir Weiss attend a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's Marek Hamsik, left, attends a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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From left to right at the foreground, Slovakia's Juraj Kucka and Marek Hamsik attend a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's head coach Stefan Tarkovic, right, watches his players during a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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The Adidas Uniforia Euro 2020 Balls are seen on a pitch during a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's Marek Hamsik, right in center, attends a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's Juraj Kucka, in center at the foreground, attends a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's players attend a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's head coach Stefan Tarkovic, right, speaks to his players during a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's head coach Stefan Tarkovic, right, speaks to his players during a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's players attend a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's Ondrej Duda attends a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's Stanislav Lobotka attends a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's players attend a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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From left, Slovakia's Stanislav Lobotka, Vladimir Weiss and Milan Skriniar attend a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's Vladimir Weiss attends a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's assistant coach Marek Mintal attends a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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Slovakia's head coach Stefan Tarkovic, right, speaks to his players during a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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From left, Slovakia's Ondrej Duda, Vladimir Weiss, Denis Vavro and Stanislav Lobotka attend a national soccer team's training session ahead of the Euro 2020 group stage match against Poland, in St. Petersburg, Russia.

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