Liverpool's squad are crying out for a player like Jonjo Shelvey at the moment, so they must be seriously regretting letting the 23-year-old go for just £5 million in 2013.
The midfielder is now coming of age in both the white of Swansea and the white of England as he looks to realise the potential he showed glimpses of during his three year spell on Merseyside.
At just 18, Shelvey was making his Liverpool debut after his £1.7 million move from Charlton but didn't have a chance to impress and was soon shipped out on loan to Blackpool.
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However after injuries to Steven Gerrard and Lucas Leiva in the 2011/12 season, Shelvey was recalled to the first team squad where he remained until the end of the season.
Shelvey signed a new deal in the summer of 2012 and a big season was expected of the, then, 20-year-old.
But after a sending off against Manchester United early in the season, his season never really got going and it was only during the Europa League campaign that he showed his true ability with four goals and a handful of impressive performances.
But he hadn't done enough to remain at Anfield and Brendan Rodgers and fellow Anfield chiefs decided the £5 million offer from Swansea was enough for his services. It was always going to be difficult for Shelvey to stamp his authority on a Liverpool midfield and Steven Gerrard's influence may have actually hindered him rather than helped.
But now a Gerrard-less Liverpool are crying out for someone of Shelvey's influence. Yes, Henderson and Milner are steady performers but are too similar. Neither too creative. That is where Shelvey could fit in. The Reds also lack defensive midfielders and Shelvey could have easily have plugged that gap.
Since moving to Wales though, Shelvey has matured both on and off the field and his performances have improved immensely. There is now a consistency to his game and also a versatility to be able to operate in both a defensive midfield position but also offensively.
Andre Ayew and Bafetimbi Gomis may have received all the plaudits for Swansea's fantastic start this season, Shelvey has gone about his work quietly but effectively. His defensive work has been brilliant but his passing ability is now right up there with the best in the league. That's no exaggeration either.
Rodgers made it clear when Shelvey left that he had attempted to keep him at the club and saw his potential but surely he could have negotiated more than £5 million.
Shelvey admitted himself in an interview with BBC Sport that: "He (Rodgers) spent hours on the phone to my dad in an effort to try and get me to stay. But I had made up my mind to come."
That figure looks an absolute steal at the moment for an England international with the best years of his career ahead of him.
Liverpool may look back on the summer of 2013 with serious regret in the coming years that they didn't include a buy-back clause in the Shelvey sale.