The FA is investigating an allegation of discrimination during Charlton's Championship match at home to Leeds on Saturday.
The allegation was included in the match official's report from the game on Saturday, which Charlton won 1-0.
The FA will now speak to the clubs and individuals concerned before deciding whether there is a case to answer.
Leeds have said they are "aware of an allegation" during the game.
The statement added: "The club will be working with the FA during their investigation.
"We will be making no further comment at this stage."