Denmark claimed the first upset of Euro 2012 by overcoming a badly misfiring Netherlands side 1-0 in their opening Group B match at Metalist Stadium here on Saturday.

Jetro Willems became the youngest player in the history of the European Championship after being named in Holland's team to face Denmark in their Euro 2012 Group B opener on Saturday.

Robin van Persie has the most to prove among the stellar Dutch starting side against Denmark here on Saturday in their Euro 2012 opener but he claims he has matured enough to deliver.

Denmark's veteran coach Morten Olsen admitted on Friday he was jealous of his side's opening Euro 2012 opponents Holland and cast his side as Group B underdogs.

Having started their march to the last World Cup final with a win over Denmark, Holland will bid to begin their Euro 2012 campaign in identical fashion when the teams meet in Kharkiv on Saturday.

Denmark midfielder Niki Zimling left the team's training session in an ambulance with an unknown injury on Friday, just a day before its opening game at the European Championship.

Even fully fit, the Netherlands defense was always going to be the team's soft spot at the European Championship. Struggling with injury makes it even worse.

Netherlands coach Bert van Marwijk on Saturday included 18-year-old defender Jetro Willems and winger Luciano Narsingh in his final 23-man European Championship squad that has a wealth of attacking options but could be frail in defense.

Netherlands coach Bert van Marwijk on Monday announced a bumper preliminary squad of 36 players for Euro 2012 in Poland and the Ukraine, which begins on June 8.