The People says West Ham boss Sam Allardyce is chasing Colombian World Cup star Balanta.
Hammers have sent top spies to Brazil to check out the 21-year-old defender ahead of a possible £6million bid.
Balanta, who plays in Argentina for River Plate, is tipped to make a move to Europe after the tournament.
West Ham have been on his trail for some time and will try to do a deal once the South Americans are out of the World Cup.
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