When Chelsea's hierarchy look back at their transfer dealings over the past decade, one name will almost certainly stand out as the one that got away.
When Romelu Lukaku arrived from Anderlecht in 2011, it was as a supporter of the team, a bonafide member of the Didier Drogba fan club, desperate to secure success.
Just a year prior to his arrival, the Belgian had visited Stamford Bridge on a school trip, with a YouTube video of him looking around the stadium still widely viewed today.
Romelu Lukaku is flying high for Inter Milan and is one of the best strikers in world footballInsurance Loans Mortgage Attorney Credit Lawyer
At Chelsea, though, it was a different story and he failed to net in 12 Premier League games
'Give me a ball and I will be playing here for five hours,' he says. 'What a stadium. The day I'm playing here, that will be the single time in life that you would see me cry. I'm going to succeed. I'm not dreaming. I'm going to play here someday I'm sure.'
And then he was given the chance to make that a reality. Unfortunately for him, and for the club, it didn't work out and Lukaku moved on having failed to score in any of his 12 Premier League appearances.
Looking back, it seems almost impossible for that to have been the case. At Everton, he came alive, at Manchester United goalscoring wasn't an issue, and now at Inter Milan he has netted 61 goals in 91 appearances.
Without doubt, Lukaku is one of the world's finest strikers, and the latest reports coming out of west London claim that Chelsea are now keen to re-sign their former player to give him a second shot at his boyhood club.
It would cost Roman Abramovich a fee in the region of £90m to get him back, a deal similar to that of Manchester United bringing back Paul Pogba from Juventus in 2016.
That, of course, has had its ups and downs, but Chelsea are in desperate need of a striker and with Erling Haaland seemingly out of the equation, there are few better options than Lukaku.
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Lukaku says he will never forgive Andre Villas-Boas for freezing him out of the first team
The Belgian fared better under Roberto Di Matteo, but still struggled to succeed at Chelsea
---- 2012–2013: West Brom (loan)
---- 2013–2014: Everton (loan)
2017–2019: Manchester United
2019–present: Inter Milan
In truth, it would make sense for all parties. First, the player. Lukaku has spoken openly of his dream at making it big at Chelsea, and although it didn't work out the first time there will be a part of the Belgian desperate to prove his detractors wrong.
And when it comes to that list of detractors, there is one man sitting right at the very top - Andre Villas-Boas. Speaking in the years since he left Chelsea, Lukaku hasn't said a bad word about the club, but there is certainly ill-feeling towards his old boss.
Villas-Boas took charge shortly before Lukaku arrived at the club, but by the time March of the following year rolled around, he was already out of work.
In that time, the striker was given very little chance to prove his worth, and he has since insisted he will never forgive Villas-Boas for exiling him from the first team.
Roberto Di Matteo stepped up to take over as caretaker boss, and immediately Lukaku noticed the changes.
'Di Matteo told me that I would stay with the group until after the [Champions League] final,' he told Het Laatste Nieuws.
'He thought everyone should come along, including the ones who were suspended and the few boys who were not in the Champions League squad. I am also grateful to him for that.
Lukaku returning to Chelsea