Denmark defender Jores Okore has signed a four year deal from Danish Superliga runners up Nordsjaelland, the English Premier League club said on Thursday.
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The 20-year-old centre back, who came on at halftime for Denmark in their shock 4-0 home defeat by Armenia in a World Cup qualifier on Tuesday, has played seven times for his country.
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Ivorian-born Okore, who made his international debut in November 2011, was part of the Euro 2012 squad but did not play in the tournament.
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Villa did not disclose the transfer fee and local media estimated he cost four million pounds.
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"He's only 20 years of age and that's good but he's also an international player at a really young age and he's played Champions League football as well which is testament to his potential," manager Paul Lambert told the Villa website (www.avfc.co.uk).
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"I'm pleased we've signed a player of his stature for he is someone who can come in and make a huge impact."
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Okore helped Nordsjaelland win the Danish Cup in 2010-11 and their first Superliga title in 2011-12.
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He played 72 games for the club including five times in the 2012-13 Champions League.
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Villa also announced the signing of Netherlands under-21 attacking midfielder Leandro Bacuna, 21, on a three-year deal from Groningen where he played 126 games, scoring 17 goals.