Bad news for defending Premier League champions Chelsea FC as their manager Jose Mourinho could face a 5 matches ban for his rift with team doctor Eva Carneiro last month.

The  Football Association of England is currently investigating a complaint in which the Portuguese manager is accused of using abusive and sexist language towards former team doctor Eva Carneiro during Chelsea’s Premier League game against Swansea City. The Blues manager could face a five-match touchline ban if found guilty of improper conduct on the field.

The English FA’s compliance department are studying a video evidence that Jose Mourinho abused Carneiro either from the touchline or as she came back down to the bench at Stamford Bridge during the game against Swansea on 8 August.

Carneiro had gone on to the pitch at referee Michael Oliver’s request to treat Eden Hazard during the final stages of the game.

Under the FA rule E3, players and coaches can be penalised for using “offensive, insulting or abusive language and/or gestures”. With an aggravated breach, in this case potentially with reference to gender, a five-match ban is a minimum punishment.

The FA was responding to a complaint made to them by a member of the public in the last few days, as it is duty-bound to do. Carneiro was dramatically demoted by Chelsea after the game.

In a footage of the incident subsequently broadcast by Sky Sports, Jose Mourinho was seen shouting angrily while he was observing Carneiro and head physiotherapist Jon Fearn from the touchline. Mourinho then had a subsequent exchange with Carneiro, a native Spanish speaking, Gibraltar-born medic, as she came down the touchline to return to her seat.

In a statement the FA said: “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.”

Doctor Eva Carneiro is yet to turn up at Cobham, the Chelsea training ground since she was taken off from on-field duties by Mourinho after the first game of the season. For the first Champions League game of the season against Maccabi Tel Aviv on Wednesday night, Mourinho continued with the new partnership of doctor Chris Hughes and physiotherapist Steven Hughes.