Ask even the most casual observer which positions are the most demanding in which to play for Liverpool under Jurgen Klopp, and the answers will almost certainly be unanimous.
Defensive midfield is one, as is being demonstrated this season in the wake of the departures of long-time servants Jordan Henderson, Fabinho and James Milner.
The other? Full-back. The manner in which Trent Alexander-Arnold and Andy Robertson have embraced the modern-day role at Anfield has helped the pair become regarded among the best attacking wide defenders on the planet. And the template set by the first team has filtered down into the Academy set-up, allowing for the progress of youngsters such as Neco Williams - now at Nottingham Forest - Owen Beck, Conor Bradley and, most recently, Luke Chambers.
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But this season has seen a shift, through both design and necessity. The former has seen Alexander-Arnold becoming further accustomed to the inverted right-back position that unlocked more from his game towards the end of last term.
And the latter has been imposed on Liverpool by the shoulder injury that has already kept Robertson out for a month and means he is unlikely to be seen in action again until next year.
With a few honourable exceptions, left-back had infamously acquired a reputation as a problem position for the Reds throughout the Premier League era until Robertson's emergence. Now it has become another headache - if not in the long-term - for Klopp.
There are, of course, options for the Reds boss, chief of which is Kostas Tsimikas. The
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