Koopmeiners was knocked out completely.

against Poland after engaging in an aerial duel with Karol Linetti

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Tun Koopminers suffered a serious injury in the opening minutes of the Netherlands Nations League match.

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When in Thursday night's Nations League match between the Netherlands and Poland

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There were terrifying scenes when the Coopminers were finished in over a minute.

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After an aerial duel with Karol Linetti,

The Atalanta midfielder made an awkward landing and appeared to sustain a sick injury.

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While going down, Linetti inadvertently grabbed the Dutchman with an elbow on the back of the head.

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And as medical personnel hastened to help the Dutchman, he was left out in the cold on the PGE Narodowy field.

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