Alla Final Four della Nations League verrà scritta una pagina della storia del calcio. L'UEFA ha infatti autorizzato per la prima volta a livello continentale l'utilizzo del VAR in occasione di partite ufficiali delle nazionali. Il primo incontro giocato con l'ausilio del giudice video sarà quello che vedrà la Svizzera affrontare i padroni di casa del Portogallo mercoledì a Porto.
L'utilizzo del VAR a livello europeo non è comunque una primizia, visto in questa stagione gli arbitri avevano già potuto usufruirne in occasione delle fasi finali della Champions e dell'Europa League. Lo stesso vale per le sfide tra Nazionali disputate sotto l'egida della FIFA, come successo ai Mondiali di Russia dello scorso anno.
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