Neil Lennon has been given until next Tuesday to respond to a Notice of Complaint issued by the Scottish Football Association's Compliance Officer after being sent off at the interval during Sunday's 3-2 Scottish Premier League defeat by Rangers at Ibrox.
The Celtic boss has allegedly breached rule 203 which states that ''No member of Team Staff shall commit Misconduct at a match, including but not limited to committing acts of the kind described in the Schedule of Offences in Annex C'' which relates to ''Misconduct at a match by dissent, the adoption of aggressive behaviour towards a match official and the repeated use of offensive, abusing and insulting language''.
After complaining to referee Calum Murray about his performance in the tunnel, the Parkhead boss was ordered to the stands but watched the second half from the media room.
Afterwards he said: ''My sending-off is a joke. I don't think I deserved to be sent off. My staff are very angry about it, my players are angry and disappointed.
''I spoke quite quietly and coldly to the referee in the tunnel. I didn't swear and didn't point any fingers.
''I told him I wasn't happy with his first-half performance. I was speaking to the match delegate after the game and their version of events are different from mine but I've got witnesses to back me up.
''Alan Thompson (coach) and our PR person was there, a couple of other members of staff and players.''
A principal hearing date has been set for Thursday, April 19.