Liverpool boss Jurgen Klopp is desperate to avoid a Carabao Cup replay.
The Times says sources close to Klopp claim he would be "horrified" at the prospect of having to replay the Reds' Carabao Cup tie at MK Dons due to the fielding of an ineligible player.
Pedro Chirivella came on as a second half substitute for Naby Keita during the 2-0 third round win last week, when the Reds' goals came from James Milner and Ki-Jana Hoever.
Following two loan spells in the Netherlands, Chirivella seemingly wasn't re-registered with the Reds following a loan spell at Spanish Segunda Division side Extremadura last season, when he also ran into registration problems and didn't play a game.
Liverpool - who were drawn to face Arsenal at home in fourth round - insist that they they did register Chirivella as their player as far back as July, and say that the blame for the apparent loss of paperwork lies with the FA.
The Reds could be expelled from the competition if the EFL decide to come down hard on them, although replaying the game or a fine seems like the much more likely outcome.