Liverpool held by Shrewsbury Town
Liverpool let a 2-0 lead slip as League One Shrewsbury earned a FA Cup fourth-round replay at Anfield thanks to a 2-2 draw, whilst Manchester United and Manchester City cruised into the fifth round on Sunday.
Jurgen Klopp showed Liverpool's focus is very much on a first Premier League title for 30 years as he made 11 changes to the side that won at Wolves on Thursday.
However, unlike against Everton in the third round, the German's gamble did not pay off despite a calm finish from 18-year-old Curtis Jones to open the scoring on 15 minutes.
Shrewsbury missed a host of chances to level before the break and seemed set to pay a heavy price when a freak own goal from Donald Love doubled the visitors' lead a minute into the second half.
The Shrews, though, did not give up on their shot at shocking the European champions and were given a lifeline when Yasser Larouci brought down Josh Laurent and substitute Jason Cummings scored from the spot.
Cummings then sent New Meadow into raptures by slotting low under Adrian 15 minutes from time.
A visibly furious Klopp threw on Mohamed Salah and Roberto Firmino from the bench in an attempt to avoid adding a replay to their congested schedule.
But it was to no avail as a draw will see his side's two-week winter break from Premier League action at the start of February shortened by a few days.