After 22 games we have conceded 13 goals its not that bad. It's bad when Mangala plays and if he does play you will get a couple. With Walker stones otamendi and Delph. It has done well this year especially with Fernandinho sat in front. KDB don't do a bad job sitting in front either.
If Liverpool do go for it, it will leave holes for Stirling and Sane ( who has been quiet of late.