FIFA on Thursday confirmed it had opened a disciplinary case against the German Football Association after fans chanted Nazi slogans during a World Cup qualifying game in the Czech Republic.
The Czech footballing authorities will also be probed over what FIFA described as “several incidents among German fans” during the countries’ match on last Friday in Prague.
Germany won the game 2-1, leaving it likely to qualify automatically for the World Cup in Russia next year.
FIFA’s investigation is expected to conclude in late September.
German fans were also the subject of a UEFA probe in 2012 after bad behavior during Germany’s clash with Portugal.