AFC Wimbledon could face disciplinary action for failing to recognise bitter rivals MK Dons by their full name for the second successive season.
Friday night's programme for the Kingsmeadow clash did not reference the home side's opponents either on the cover or inside, while their official Twitter feed simply referred to Robbie Neilson's team as Milton Keynes throughout their match coverage.
The rivalry stems from the original Wimbledon side, who won the FA Cup in 1988, relocating to Milton Keynes in 2002.
The EFL had contacted AFC Wimbledon before the match to ensure there would be no repeat of last season's situation, but the club appear to have ignored their request.
The EFL Board will now investigate the matter, which could be referred to a Disciplinary Commission.
A statement read: "Prior to Friday evening's League One fixture between AFC Wimbledon and MK Dons, the EFL sought assurances from the home club that the game would be treated in a consistent and appropriate manner to any other taking place at the Cherry Red Records Stadium.
"Any deviation from this needed to be with the agreement or understanding of MK Dons.
"This approach was taken following the actions of AFC Wimbledon at the corresponding fixture last season when the visiting club was not referred to by its full name of MK Dons in a number of circumstances.
"The EFL is more than aware of the issues around the creation of MK Dons and the upset this caused for the then, Wimbledon FC.
"The failure to recognise MK Dons in the correct manner causes reputational issues for the EFL as well as creating the potential for unrest amongst MK Dons supporter and, as such, is of concern for the EFL.
"Under new EFL regulations 3.4 and 3.5 all clubs are required to behave towards one another with the 'utmost good faith' and not to 'unfairly criticise, disparage, belittle or discredit' any other club.
"Following reports regarding last night's fixture, it would appear that a similar situation has transpired and, as a result, the EFL Board will request the observations of AFC Wimbledon at the earliest possible opportunity.
"If the club is charged with a breach of EFL regulations then the matter would be referred to a Disciplinary Commission."
