Spanish midfielder Pedro Chirivella showcased as a substitute for Liverpool after coming on for the past 28 minutes of the 2-0 third-round win a week.
Chirivella, who was on loan in Spanish center Extremadura last year, wasn’t registered to play with Jurgen Klopp’s side at Stadium MK.
Liverpool hadn’t secured a global transfer certificate, which was required after the 22-year-old’s return to Anfield after his loan.
But rather Liverpool have been fined, together with #100,000 of this penalty suspended.
“After a detailed review of all of the signs, the board decided it was not appropriate to divert the club in the contest due to numerous endogenous variables,” a Football League statement stated.
A Liverpool club spokesperson stated: “The team takes the decision, punishment and outcome levied from the EFL.
“We think it’s proportionate with the specialized indiscretion dedicated and will be making no additional representations.
“Although there have been mitigating factors that have been outside our control or authority, we consider it right we apologize to the contest’s governing body and Milton Keynes Dons.”
Liverpool asked the paperwork July however, the procedure can only be performed together with the English Football Association’s intervention.
It’s thought that is where the Champions League holders believe the mistake was made.
“Specifically, the board said that the club had sought the aid of the Football Association in securing the return of this worldwide clearance ahead of the beginning of this year,” the announcement said.
Liverpool will be responsible to pay the frozen #100,000, also confront another sanction, should they fielded an ineligible participant again at the League Cup before the end of next year.