Indeed, the centre-back is a QPR player on loan at Anfield, having spent the first half of the season on loan at Southampton.
Both the Saints and R's faithfuls don't exactly hold Caulker in high esteem. But, so far at Liverpool, he's done a job.
Caulker was given a few minutes here and there and was then thrown in against West Ham. Generally, he performed very well.
There were still the odd jokes on Twitter, of course. Both Southampton and QPR fans expected a guaranteed loss for the Reds once they saw the 24-year-old's name o=in the starting line-up.
But Caulker may have disappointed his critics as Liverpool kept a clean sheet against the Hammers. Here's what Saints and QPR supporters said on Twitter before, during and after the game...
Caulker and Lovren together.— Nick Holmes (@Latheal) January 30, 2016
That's like the footy equivalent of Suicide Squad.
Perhaps Klopp is a genius after all.#saintsfc
I see Caulker remains as gaff-prone as when he was at Loftus Road. That HANDBALL would be called "traveling" in basketball.#QPR— Ray Eaton (@RaymondEaton2) January 30, 2016