Not sure why people are questioning his inability to get into the Southampton line-up, when Fonte is their captain and Van Dijk is one of the best summer signings this season. After all, we've brought Ilori back on loan when he couldn't get into the back four of one the worst PL sides ever.
We have injuries. Sakho is injured and injury-prone. Skrtel is out for a while. Ilori is injury-prone. Lovren is injured. Kolo is injury-prone. Klopp won't play Can in defence. We have had to play Lucas as a CB this season. We had to bring Enrique out of the football wilderness to play CB, despite being persona non grata and not playing for a year.
This is Caulker's last shot at playing for a big club. It might be his only chance to ensure he won't be playing in the Championship next season. It fills a need for all parties. He'll have a better chance of getting games here, due to our injuries. If he's good, it benefits all parties. If he's poor, he's only here until May. A logical signing.