Belgium defender Daniel van Buyten said he's not a fan of U.S. coach Jurgen Klinsmann, despite the Americans defying odds and advancing out of Group G of the World Cup, according to a report.

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"I am not impressed by Klinsmann," Van Buyten told reporters at Belgium's World Cup training base, according to Goal.com. "He is just a coach who knows how to conduct his group and get the maximum out of them by motivating them. The USA will certainly be organized."

Van Buyten's comments may stem from some past resentment from Klinsmann's time as manager at the center back's club Bayern Munich back in the 2008-2009 season. The manager reportedly promised that the Belgian would start in the club's Champions League tie against Sporting Lisbon but left him out entirely.