English Football Association is looking into a complaint that Chelsea boss, Jose Mourinho, used abusive or sexist language towards team doctor, Eva Carneiro.
A member of the public emailed the FA, which is studying footage from the 2-2 draw with Swansea on August 8.
Carneiro is yet to return to work after being criticised by Mourinho and her role being downgraded.
The complaint is unlikely to result in a prosecution.
FA regulations state that players and coaches can be penalised for using “offensive, insulting or abusive language and/or gestures”.
Aggravating circumstances, such as the use of sexist language, can lead to a minimum five-match ban, if the accused is found guilty.
Carneiro and head physio Jon Fearn went on the pitch to treat Eden Hazard during their game with the Swans.
Chelsea were temporarily reduced to nine men, with goalkeeper Thibaut Courtois having already been sent off, and Mourinho said the duo had been “impulsive and naive”.
Carneiro has been in ongoing discussions with her lawyers, although she was close to a return to first-team duties.
Chelsea, who play Arsenal at Stamford Bridge in the Premier League on Saturday are refusing to comment on what they see as an internal staff matter.
