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Jurgen Klopp's shopping list is dwindling by the day. The arrival of Georginio Wijnaldum takes the number of summer arrivals up to seven; the number of positions strengthened, four.

The Dutchman adds goals to the midfield. It will be the Liverpool boss' hope that Loris Karius helps stop them; so, too, Joel Matip in defence. Sadio Mane, meanwhile, should add pace and penetration to the attack.

In the space of a month or so, then, Liverpool have welcomed in players who have reinforced – if not downright bettered – the positions of goalkeeper, centre back, central midfield and out wide.

The squad is starting to take shape, with its depth apparent. Klopp was keen to add to certain areas, and has done that with three weeks of pre-season remaining.

All except left back, that is.

It was a position Klopp identified early on. Alberto Moreno is the current number one choice, but he faces little competition. Brad Smith remains promising but raw, with a host of Championship clubs interested in taking the Australian on loan. Jon Flanagan is another option in that position , but is mulling over an opportunity to play regular first team football with Burnley next season. Ragnar Klavan, a £4.2million signing from Augsburg, can also play there if necessary.

After Moreno's Europa League final display, plenty want a new left back to displace the Spaniard. That is not Klopp's plan, however. He wants somebody who can come in whom he can develop and challenge Moreno, rather than unceremoniously usurp him.

Ben Chilwell, of Leicester City, was identified. Having impressed Klopp's close friend David Wagner at Huddersfield, the Reds looked to bring the highly-rated full back to Anfield. But after the Foxes demanded £10million for the teenager – a price Liverpool were unwilling to meet, having offered a deal worth £7million – the deal appeared to reach an impasse.

Now, reports from the Midlands suggest Chilwell could be about to sign a new contract at the King Power Stadium. With just 12 months left to run on his current deal, it would surely signal the end of Liverpool's hopes of taking him to Anfield this summer.

A deal which was proving difficult could become even more so now. What will Klopp do?

Here are some potential left back options in the market this summer.

Sticking with the model – Cristian Cuevas

If Klopp wants to stick to the model that saw him interested in Chilwell, perhaps Cristian Cuevas is the best alternative. Like Chilwell, he comes from a Premier League rival; like Chilwell, he is not getting the opportunities his talent deserves.

Bought by Chelsea in 2013, the Chilean has yet to make a first-team appearance for the London club, and has been sent on loan to Vitesse, FC Eindhoven, Universidad de Chile and Sint-Truiden. It was at Sint-Truiden, in Belgium, where he shone brightest. At 21, there is scope for improvement, and seems to fit the progressive profile sought. How he would take to regular game time in the Premier League, however, is another matter.

The fan favourite – Jonas Hector

Let's get this one out of the way, then.

The Koln and Germany star is not currently on the club's radar, despite consistently being linked with a move to Anfield.

But could the potential collapse of the Chilwell deal see the Reds finally take the plunge on the 26-year-old?

Only Moreno created more chances at left back in the top European leagues last season and, though he would stifle the progression of Moreno, he would come with a decent pedigree having performed well at Euro 2016.

The fans would be ecstatic, too.

The statisticians' choice – Marcos Alonso

Moreno and Hector were the most creative left backs in Europe last season in terms of key passes, but Marcos Alonso is not too far behind. With 39 in Serie A for Fiorentina last season, only the aforementioned duo – as well as Marcelo, Philipp Lahm and Christian Fuchs – managed more. The 25-year-old enjoyed a stellar season in Florence, and has Premier League experience from his time at Bolton and Sunderland. It was at the Stadium of Light, in 2013/14, where the Spaniard averaged a key pass per game.

The Bundesliga bargain – Santiago Garcia

The signings of Klavan and Alex Manninger demonstrate Klopp is not afraid to acknowledge when a short-term solution is needed. With his knowledge of the Bundesliga unparalleled, perhaps he will be forced into scouring the German league once more in search of a problem-solver.

Step forward Santiago Garcia. The Werder Bremen man is 28 years old and stands at six foot three – which would add even more height to the side. An unforgiving full back who is very much about defending, he would offer a different sort of option to Moreno.

The proven Premier League talent – Aaron Cresswell

(Image: 2016 Getty Images)

A Scouser with a wand of a left foot, energy in abundance and a real chance of even more progression. What more could the Reds want? A pity West Ham would not entertain the idea of letting the 26-year-old leave.