Manchester United are contesting Jose Mourinho’s Football Association charge for using foul language.
United rallied from two goals down to secure a memorable 3-2 victory at Old Trafford on October 6 – a match played out to a background of scrutiny and speculation about the hosts’ manager.
Footage shows the 55-year-old making comments in Portuguese, while at one point looking into a camera, as he headed towards the tunnel after the final whistle.
The FA subsequently charged the United manager with using abusive, insulting or improper language, and he was given an extension until Wednesday at 6pm to answer.
It is understood that the charge is being vigorously contested by United, with Mourinho sweating on a possible touchline ban.
It is unclear whether a personal hearing has been requested at the commission, that will be set in due course.
Former United captain Wayne Rooney was handed a two-match suspension for his four-letter outburst after scoring a hat-trick at West Ham in April 2011.