FIFA are investigating Josip Simunic's controversial celebrations after Croatia secured their place in the FIFA World Cup finals.
The defender took to the microphone on the pitch at the Maksimir Stadium in Zagreb on Tuesday night and chanted "For the homeland!", to which fans responded "Ready!".
That was the cry used by the Croatian pro-Nazi puppet regime called the Ustashas, who ruled the state when thousands of people were killed in concentration camps during World War II.
Reports suggest Simunic could be disciplined by FIFA and the world governing body confirmed they are looking into the incident.
A FIFA spokesperson told Perform: "We are in the process of analysing the different match officials' reports and gathering information. We cannot comment further for the time being."