London - The English Football Association are investigating an allegation that Charlton's Jonathan Leko was racially abused by a Leeds player during Saturday's Championship match.
Charlton claim on-loan West Brom forward Leko was subjected to the taunt during their 1-0 win at The Valley.
It is believed the allegation was included in the match official's report from the game.
The FA will now speak to the clubs and individuals concerned before deciding whether there is a case to answer.
"Charlton Athletic can confirm that an allegation of racial abuse directed at Jonathan Leko by an opposing player during Saturday's game against Leeds was reported to referee John Brooks," a Charlton statement said on Tuesday.
"The Football Association are carrying out an investigation following the report.
"The club will support Leko throughout the process and will not be making any further comment until the investigation is concluded."
Under rules introduced for the 2019-20 season, the minimum suspension for a player found guilty of an aggravated breach of the FA's discrimination rules will be six matches, which can be increased depending on any additional aggravating factors.