In an alternate universe, would Harry Kane currently be leading Arsenal's charge up the Premier League table? Would Alfredo Di Stefano have inspired Barcelona to win five consecutive European Cups in the 1950s? Had history panned out slightly differently, maybe. Looking at those two examples and several others, here's six individuals who became legends at one club but could so easily have been legends somewhere else instead... Legendary manager Alex Ferguson took a hands on approach in signing...
Harry Kane - Arsenal
"I didn't know, I read it in the papers. I found it quite funny, you know, and you are always a bit angry as well because I asked: "Why did he go?'," were Arsene Wenger's words when the subject of Tottenham star Harry Kane's beginnings at Arsenal was a topic of debate in 2015.
Although Kane maintains he has always been a Spurs fan, as an 11-year-old he spent a season with Arsenal's academy between 2001 and 2002. He was quickly released, eventually going on to join Tottenham in 2004, around the same time a picture of him wearing an Arsenal shirt to attend the 'Invincibles' victory parade was taken.
Either way, he's Spurs through and through now, but just imagine if it was fans at the Emirates Stadium singing 'he's one of our own' rather than White Hart Lane.
Jamie Carragher - Everton
There is a famous picture of a young Steven Gerrard wearing an Everton kit from 1987, posing with the Toffees' First Division trophy. The Liverpool legend actually had a number of different kits as a youngster, including Manchester United and Norwich, as different family members pulled his allegiance in different directions.
But while Gerrard joined Liverpool as his first professional club shortly after that 'Everton moment', long-time Reds colleague and Anfield legend Jamie Carragher actually did spend some time as an Everton junior before switching colours.
Carragher grew up an Everton fan and would often turn up for Liverpool training sessions in a Toffees kit. He even briefly joined the youth setup at Goodison Park instead, only pledging himself to Liverpool permanently after it was decided his career would benefit more from the superior coaching on offer at the time.
Alfredo Di Stefano - Barcelona
Although the subject is much debated and filled with conspiracy theories involving infamous military dictator General Franco, it was Barcelona and not Real Madrid that appeared set to land a coveted South American striker by the name of Alfredo Di Stefano in the early 1950s.
The Catalans paid the sum of 4.5m pesetas to River Plate, whom they believed own the player's registration, and even brought him over to Europe in 1953 where it is thought that Di Stefano played at least one pre-season game for the club.
The move was ratified by FIFA but rejected by the Spanish federation because of a messy ownership situation that had actually seen the player turn out for Colombian outfit Millonarios for four years. When Real came on the scene, Barça eventually backed down, some believe as a result of shady interference from anti-Catalan Franco, and the rest is history.
Raul - Atletico Madrid
No Real Madrid player has ever played more games for the club than Raul's record tally of 741, while only Cristiano Ronaldo has scored more goals than the home-grown hero's haul of 323. And yet, had things turned out differently, it could easily have been across the Spanish capital at Atletico Madrid where the Bernabeu icon emerged instead.
Raul didn't actually arrive at Real until the age of 15 in 1992. He'd been picked up by Atletico two years earlier and joined the junior ranks there, only for the club's colourful and occasionally criminal president Jesus Gil to shut down the youth division because there was 'no point' in having it and no money available to run it.
With no one to play for, Raul joined Los Blancos and had made made his debut by 1994.
David Beckham - Tottenham Hotspur
North London-born David Beckham grew up with a heavy Tottenham Hotspur influence in his life from his grandfather, even starting his blossoming football career with Spurs where he was briefly a team-mate of future England colleague Sol Campbell.
But Beckham, who gained national attention as a boy from his attendance at one of Sir Bobby Charlton's soccer schools, was a die-hard Manchester United fan like his father. He would apparently report to Tottenham training wearing his United kit and eventually made the switch north to Manchester at the age of 14.
Beckham was famously part of United's 'Class of '92', winning the FA Youth Cup alongside Gary Neville, Ryan Giggs and Nicky Butt - Paul Scholes didn't play either leg of the final - and later went on to win multiple Premier League trophies as well as become England captain.
John Terry - Manchester United
Legendary manager Alex Ferguson took a hands on approach in signing the best young talent for Manchester United's junior ranks, personally getting to know the likes of Ryan Giggs and David Beckham to get them to sign schoolboy forms with the club over any other.
He tried the same tactic with a 14-year-old John Terry back in the mid 1990s, too, inviting the youngster and his family to Old Trafford to give him the full treatment.
"I was Man United growing up. You know what it's like when you're a boy, you want to support the team that's winning everything. And my dad and granddad were Man United fans," Terry said in a 2006 interview with The Observer.
"I met Alex Ferguson - great to meet. During the school holidays I would go up to Manchester and train with their boys for two weeks, play a few games and come home. I think it was hard for my dad to take that I was going to sign for Chelsea, but I had to sit him down and tell him it was definitely the right decision."