The English Football Association chairman Greg Clarke has criticised the behaviour of some England fans during Wednesday night's international friendly against Germany.
The 1-0 defeat in Dortmund was marred by supporters booing the German national anthem, and singing distasteful songs towards the host nation.
Clarke says the chants were "inappropriate, disrespectful and disappointing".
In a statement, he said: "The behaviour of a section of the England support in Dortmund last night was inappropriate, disrespectful and disappointing.
"The FA has consistently urged supporters to show respect and not to chant songs that could be regarded as insulting to others. Individuals who engage in such behaviour do not represent the overwhelming majority of England fans nor the values and identity we should aspire to as a football nation.
"We are working with the England Supporters Travel Club and speaking with the Football Supporters' Federation to come together to address this issue.
"Everyone involved in the game has a responsibility to ensure that attending a football match is a safe and enjoyable experience for all."
A goal from Lukas Podolski proved to be the difference between the sides with the German forward making his 130th and final cap for the reigning World Cup holders.
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