Trent Alexander-Arnold has both debuted and won the Champions League with the No.66 on the back of his shirt.
The No.2 shirt is currently worn by Nathaniel Clyne, who Alexander-Arnold moved ahead in the pecking order to cement himself as the club's first-choice right-back.
But even if the traditional right back number was available, it doesn't seem likely that Alexander-Arnold would switch from a number that has little sentimental value but has served him very well in his four years as a professional footballer.
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Liverpool's kit management coordinator Lee Radcliffe has opened up about the 21-year old's laid-back nature in regards to his shirt number.
"When we get any young lads that come down from the Academy, we always deliberately try to give them a high-ish number," Radcliffe told the official LFC website.
"We don't like to give them a low number in case they sort of think they've made it straight away, if you know what I mean.
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You pick it out because it's a free number and it's around that sort of number you think, 'We'll give that out because he's only just come down.'
"When you see him now lifting trophies and celebrating with No.66 on the back, it's a weird feeling and I can't really describe it. It's weird to see such a high number and for someone to be happy with it!
"Someone like Trent has just been happy to be around the first team and obviously doesn't realise how good he is. He doesn't really ask for anything, to be honest.
"I think he's so laidback that he's obviously been given the number and thought, 'Yeah, that'll do me, I'll keep that,' and not realised how iconic its become over the years."
Under Jurgen Klopp, the academy product has blossomed into arguably the best right-back in world football. He was integral to the club's sixth European Cup triumph last term and has been key as the Reds look set to finally win the Premier League this campaign.
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In 125 appearances, the England international has 34 assists from right-back and chipped in with six goals.
Liverpool are genuinely sorted at right-back for the next ten years and beyond and if they feel the need to switch Alexander-Arnold into midfield, then he probably slot in there with ease too.
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