#4 The defence
In defence, Liverpool made a clear statement of intent and by signing Virgil van Dijk making him the most expensive centre-half. The centre-backs Liverpool have at this time are not bad players per se, but what hurts Liverpool often is a clear lack of leadership in the back-line.
If van Dijk can show the kind of leadership to organise the Liverpool back four, the way the likes of John Terry and Nemanja Vidic, for example, did for their respective clubs then a lot of Liverpool's issues will be solved defensively.
Where Liverpool could make its defence stronger is if they add a left-back who would be an upgrade to their current options.
Ryan Bertrand of Southampton and Alex Telles of Porto are good candidates that are worth considering. The latter has been linked to Liverpool this month in Portuguese media outlets such as Ojogo.