In many areas of Liverpool’s squad, the identities of the established first choice and deputy for a particular position are well established.
Caoimhin Kelleher is the back-up goalkeeper behind Alisson Becker, while Jurgen Klopp can call upon Kostas Tsimikas if Andy Robertson needs a break at left-back.
But on the opposite side of the defence the decision is not so clear-cut. Trent Alexander-Arnold is obviously the number one choice and will remain so for the remainder of his career.
There are however two young international footballers competing to be Klopp’s preferred stand-by option for when his number 66 is rotated out of the side.
Whomever out of Conor Bradley and Neco Williams is part of the starting XI for the Carabao Cup trip to Preston on Wednesday may well have moved ahead of the other in the pecking order at right-back.
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Based on their careers to date, Williams holds a significant advantage. Two years senior to Bradley, he has already made 27 appearances for the Reds, including 13 in the league and five in Europe.
While he may not have broken his goal scoring duck for Liverpool, the young Welshman has three assists, all of which have been memorable in their way.
His first was a cross from which Divock Origi equalised in the fourth minute of stoppage time against Arsenal two years ago.
It made the score 5-5, took the tie to penalties and ultimately saw an understrength Liverpool side progress to the next round of the League Cup.
The following season, Williams set up the only goal of a Champions League win over Ajax, floating the ball towards the back post which allowed Curtis Jones to profit from a goalkeeping mistake.
His most recent assist was perhaps the most notable of the trio though, and not just because it enabled Roberto Firmino to complete his hat-trick against Watford.
In order to be in position to put a goal on the plate for the Brazilian, Williams first had to dribble past Danny Rose.
Mohamed Salah had been tormenting the former Tottenham full-back all afternoon, the fact alone that Liverpool’s number 76 succeeded in similar fashion isn’t overly noteworthy.
But the fact his completed take-on resulted in a goal is significant, as the Egyptian is the only other Liverpool player to record a dribble leading to a goal in either league or Europe this season ( per FBRef ).
Salah and Wolves’ Raul Jimenez aside, no player has more than one successful take-on resulting in a goal in the Premier League either.
With his assist for Wales in their recent 2-2 draw with Czech Republic, Williams is certainly making the most of his limited opportunities for club and country this season.
The same can be said for Bradley though, even if he is yet to create or score or senior goal.
The 18-year-old has come fairly close to doing so, laying on a clear-cut chance for Josh Magennis in Northern Ireland’s 2-1 defeat in Bulgaria earlier this month.
And when he made his one previous Liverpool appearance, in the 3-0 win against Norwich in the Carabao Cup, he created three goalscoring opportunities. It was the joint-most by any Reds player that night, alongside fellow deputy full-back Tsimikas.
Bradley also showed his defensive mettle by making five tackles – at least three more than any other Liverpool player – and only the centre-back pairing of Joe Gomez and Ibrahima Konate attempted more passes.
His busy night ensured the young right-back had more touches of the ball than anybody else from either side.
While Williams has the edge in terms of experience, Bradley has looked the part too.
It will be fascinating to see which youngster gets the nod from Klopp at Deepdale, as both are very capable of making a significant contribution to a cup win.