Liverpool are currently facing the prospect of going a full summer transfer window without making a single new signing. The Reds had looked in strong position in terms of squad depth heading into the off-season and that remains the case. However, there are also one or two obvious areas of the Liverpool squad which could do with a little bit of an upgrade. With Arne Slot having decided to put Wataru Endo up for sale, the most obvious of these positions has been in defensive midfield. Liverpool clearly thought so too and tried to sign Martin Zubimendi from Real Sociedad. But with that deal now d…