Chelsea are out of the FA Cup after letting a lead slip in losing 2-1 at Brighton.
Newcastle came from behind to progress to the fifth round after a 3-2 defeat of Birmingham.
Plymouth are the latest team to try and put an end to Liverpool's hopes of a quadruple this afternoon.
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The Championship strugglers take on Arne Slot's high flying Reds in the fourth round of the FA Cup at 3pm.
Before that, Blackburn and Wolves meet at 12:30pm while the action concludes with the clash of Aston Villa and Tottenham at 5:35pm.
