The FA is investigating a complaint Jose Mourinho used abusive language during the incident that saw Chelsea doctor Eva Carneiro axed.
According to a report in the Independent, the FA received a complaint after the match against Swansea on 8 August and the governing body’s compliance department are now studying video evidence.
Mourinho could face up to a five-match ban if found guilty.
Club doctor Carneiro and first-team physiotherapist Jon Fearn were heavily criticised by Chelsea boss Mourinho for running on to the field to treat Eden Hazard after he was injured during stoppage time of the 2-2 draw at Stamford Bridge.
“The FA has received an enquiry relating to an alleged incident during the Premier League fixture between Swansea v Chelsea on 8 August, and will make no further comment at this time,” read a statement.
Under rule E3, players and coaches can be penalised for using “offensive, insulting or abusive language and/or gestures.”
Sky Sports released video footage of the moment Mourinho lost his temper with his medical staff which appears to show the Portuguese calling one or both of them “son of a bitch”.
Carneiro has not returned to Chelsea’s Cobham training ground since being withdrawn from matchday duties, with doctor Chris Hughes and physiotherapist Steven Hughes having replaced her and Fearn.