The three teams are in danger of receiving a sanction, as Birmingham has received already, with one of the worst punishments: a points reduction by the EFL.
In Birmingham's case, the sanction saw them lose nine points and the reason for the punishment (as it could be for Sheffield Wednesday, Derby County and Aston Villa), financial irregularities.
Birmingham, the only team to be sanctioned thus far, "violated the requirements" of the competition, according to EFL and registered huge losses of over 40 million euros in the last three years.