The Scottish Football Association has issued Celtic manager Neil Lennon with a Notice of Complaint following Sunday's Glasgow derby at Ibrox.

At half-time in the match, which Celtic lost 3-2 to Rangers, Lennon was told by referee Calum Murray that he could not return to the touchline.

SFA Compliance Officer Vincent Lunny has now ruled that Lennon may have breached the governing body's rules and has asked for a response by Tuesday, April 3.

Lennon has been called to respond to an allegation that he was in breach of rule 203, which reads: "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".

The section of Annex C in question refers 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."

Lennon said that he was unhappy with Murray in his comments after the game but STV understands that disciplinary proceedings also focus on his exchanges with fourth official Iain Brines.

The Celtic manager had insisted that his discussions with Murray at half-time had been calm and had not involved any swearing or aggressive behaviour. He also questioned why the referee had refused to discuss the matter after the match.

The SFA's Post Match Protocol allows for managers to speak with match officials after the game but only after 15 mins has elapsed and if representatives from the club and assistant referees are present.

However, the Protocol does state that " at his sole discretion, the referee is entitled to decline to meet the manager or coach"

The Celtic manager has already been asked to explain comments made after last weekend's League Cup final and with that case currently ongoing, no fixed suspension offer could be offered to Lennon following the Rangers match.

A response to the SFA's letter regarding that incident is due by March 30, after which the Compliance Officer could decide to take no further action, offer a fixed ban or call the manager to the SFA's Judicial Panel.