Some of them might not know why they’re quite so against the signing - all they know is that they are.
But if they cast their minds back to October 2014, and specifically the Premier League match between Queens Park Rangers and Liverpool at Loftus Road, perhaps therein lies the answer.
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At the end of an action-packed second half, Caulker gifted Liverpool all three points after turning Raheem Sterling’s squared pass into the back of his own net.
In fairness to the centre-back, he didn’t have much time to react. The ball hit his standing leg and that was that.
Video: Steven Caulker's own goal
Liverpool needed another defender
Jurgen Klopp, presumably on the advice of Liverpool’s transfer committee, has signed Caulker until the end of the season with his team currently in the midst of an injury crisis.
Martin Skrtel, Dejan Lovren, Mamadou Sakho, Joe Gomez, Kolo Toure and Jon Flanagan are all sidelined - and that’s just the defenders.
Klopp was keen to bring in a new defender in time for Wednesday night’s Premier League fixture against Arsenal at Anfield and he’ll be relieved to have succeeded - even if he knew little about Caulker before the start of the week.
However, the 24-year-old has hardly played this season.
Caulker made just one Premier League start for Southampton, who agreed to cancel the QPR defender’s loan deal, and played a total of 145 minutes.
The likes of Olivier Giroud, Alexis Sanchez and Mesut Ozil must be licking their lips at the prospect of facing Caulker and co. tomorrow night.
Is Steven Caulker a terrible signing for Liverpool? Let us know by leaving a comment below.