U.S. sportswear maker Nike Inc, battling Adidas AG to be the worlds biggest soccer brand, expects kit sales to keep growing fast after the World Cup, its chief executive was quoted as saying in a German newspaper. Nike last month reported soccer-related revenue rose 21 percent, excluding currency fluctuations, to $2.3 billion in the financial year ended May 31. I promise you it will continue like that in the next year, CEO Mark Parker told the Handelsblatt daily, in an interview due for publication on Wednesday, adding that the $2.3 billion did not include a few hundred million dollars from soccer lifestyle products such as football-themed tops. Nike and Adidas are battling for supremacy in the soccer kit industry, with the American company having made big inroads into a sport that its German rival long dominated despite the fact Adidas has been a World Cup sponsor since 1970.